It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil) creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature-a result that would be equally disastrous（災(zāi)難的）. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do riot know for sure that either of these conditions will happen(though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

As pointed out at the beginning of the passage, people used to think that air pollution ______.

       A．caused widespread damage in the countryside

       B．a(chǎn)ffected the entire eastern half of the United States

       C．a(chǎn)lmost brought worldwide effect

       D．existed merely in urban and industrial areas

As far as the greenhouse effect is concerned, the author _____________.

       A．shares the same view with the scientists

       B．is uncertain of its occurrence

       C．rejects it as being ungrounded（無根據(jù)的）

       D．thinks that it will increasingly destroy the world soon

It can be inferred from the passage that                    .

       A．raising the world’s temperature a little would not do much harm to life on the earth

       B．lowering the world’s temperature a little would lead to agricultural disasters

       C．a(chǎn)lmost no temperature variations have occurred over the past decade

       D．the world’s temperature will remain stable forever

This passage is primarily concerned with              .

       A．the greenhouse effect in the world

       B．the measures to adjust the climate

       C．the potential effect of air pollution

       D．the measures to protect the environment

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is actually worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect" - holding in heat reflected from the earth and raising the world's average temperature. If this view is correct and the world's temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate (廢氣排往空中而形成的微粒、顆粒) matter in the atmosphere is blocking sunlight and lowering the earth's temperature ─ a result that would be equally disastrous. A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.

As pointed out at the beginning of the passage, people used to think that air pollution ______.

    A. caused widespread damage in the countryside

    B. affected the entire eastern half of the United States

    C. had damaging effects on health

    D. existed merely in urban and industrial areas

As far as the greenhouse effect is concerned, the author ______.

    A. shares the same view with the scientists

    B. is uncertain of its occurrence

    C. rejects it as being ungrounded

    D. thinks that it will destroy the world soon

The underlined word “offset" in Para. 2 could best be replaced by______.

    A. slip into    B. make up for  C. set up   D. catch up with

This passage is mainly concerned with ______.

    A. the greenhouse effect                B. the burning of fossil fuels

    C. the potential effect of air pollution    D. the possibility of a new ice age

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is actually worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect" - holding in heat reflected from the earth and raising the world's average temperature. If this view is correct and the world's temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate (廢氣排往空中而形成的微粒、顆粒) matter in the atmosphere is blocking sunlight and lowering the earth's temperature ─ a result that would be equally disastrous. A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.

As pointed out at the beginning of the passage, people used to think that air pollution ______.

       A. caused widespread damage in the countryside

       B. affected the entire eastern half of the United States

       C. had damaging effects on health

       D. existed merely in urban and industrial areas

As far as the greenhouse effect is concerned, the author ______.

       A. shares the same view with the scientists

       B. is uncertain of its occurrence

       C. rejects it as being ungrounded

       D. thinks that it will destroy the world soon

The underlined word “offset" in Para. 2 could best be replaced by______.

       A. slip into    B. make up for       C. set up        D. catch up with

This passage is mainly concerned with ______.

       A. the greenhouse effect                   B. the burning of fossil fuels

       C. the potential effect of air pollution        D. the possibility of a new ice age

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil) creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.
Another view, less widely held, is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature-a result that would be equally disastrous（災(zāi)難的）. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do riot know for sure that either of these conditions will happen(though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.
【小題1】As pointed out at the beginning of the passage, people used to think that air pollution ______.

A．caused widespread damage in the countryside

B．a(chǎn)ffected the entire eastern half of the United States

C．a(chǎn)lmost brought worldwide effect

D．existed merely in urban and industrial areas

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil) creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature-a result that would be equally disastrous（災(zāi)難的）. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do riot know for sure that either of these conditions will happen(though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

1.As pointed out at the beginning of the passage, people used to think that air pollution ______.

      A．caused widespread damage in the countryside

      B．a(chǎn)ffected the entire eastern half of the United States

      C．a(chǎn)lmost brought worldwide effect

      D．existed merely in urban and industrial areas

2.As far as the greenhouse effect is concerned, the author _____________.

      A．shares the same view with the scientists

      B．is uncertain of its occurrence

      C．rejects it as being ungrounded（無根據(jù)的）

      D．thinks that it will increasingly destroy the world soon

3.It can be inferred from the passage that                    .

      A．raising the world’s temperature a little would not do much harm to life on the earth

      B．lowering the world’s temperature a little would lead to agricultural disasters

      C．a(chǎn)lmost no temperature variations have occurred over the past decade

      D．the world’s temperature will remain stable forever

4.This passage is primarily concerned with              .

      A．the greenhouse effect in the world

      B．the measures to adjust the climate

      C．the potential effect of air pollution

      D．the measures to protect the environment

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is actually worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect" - holding in heat reflected from the earth and raising the world's average temperature. If this view is correct and the world's temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate (廢氣排往空中而形成的微粒、顆粒) matter in the atmosphere is blocking sunlight and lowering the earth's temperature ─ a result that would be equally disastrous. A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.

1. As pointed out at the beginning of the passage, people used to think that air pollution ______.

   A. caused widespread damage in the countryside

   B. affected the entire eastern half of the United States

   C. had damaging effects on health

   D. existed merely in urban and industrial areas

2. As far as the greenhouse effect is concerned, the author ______.

   A. shares the same view with the scientists

   B. is uncertain of its occurrence

   C. rejects it as being ungrounded

   D. thinks that it will destroy the world soon

3. The underlined word “offset" in Para. 2 could best be replaced by______.

   A. slip into         B. make up for      C. set up          D. catch up with

4. This passage is mainly concerned with ______.

   A. the greenhouse effect                 B. the burning of fossil fuels

   C. the potential effect of air pollution                   D. the possibility of a new ice age

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil) creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature-a result that would be equally disastrous（災(zāi)難的）. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do riot know for sure that either of these conditions will happen(though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

1.As pointed out at the beginning of the passage, people used to think that air pollution ______.

      A．caused widespread damage in the countryside

      B．a(chǎn)ffected the entire eastern half of the United States

      C．a(chǎn)lmost brought worldwide effect

      D．existed merely in urban and industrial areas

2.As far as the greenhouse effect is concerned, the author _____________.

      A．shares the same view with the scientists

      B．is uncertain of its occurrence

      C．rejects it as being ungrounded（無根據(jù)的）

      D．thinks that it will increasingly destroy the world soon

3.It can be inferred from the passage that                    .

      A．raising the world’s temperature a little would not do much harm to life on the earth

      B．lowering the world’s temperature a little would lead to agricultural disasters

      C．a(chǎn)lmost no temperature variations have occurred over the past decade

      D．the world’s temperature will remain stable forever

4.This passage is primarily concerned with              .

      A．the greenhouse effect in the world

      B．the measures to adjust the climate

      C．the potential effect of air pollution

      D．the measures to protect the environment

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is actually worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect" - holding in heat reflected from the earth and raising the world's average temperature. If this view is correct and the world's temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.
Another view, less widely held, is that increasing particulate (廢氣排往空中而形成的微粒、顆粒) matter in the atmosphere is blocking sunlight and lowering the earth's temperature ─ a result that would be equally disastrous. A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.

1. 1.

   As pointed out at the beginning of the passage, people used to think that air pollution ______.

   1. A.
      caused widespread damage in the countryside
   2. B.
      affected the entire eastern half of the United States
   3. C.
      had damaging effects on health
   4. D.
      existed merely in urban and industrial areas
2. 2.

   As far as the greenhouse effect is concerned, the author ______.

   1. A.
      shares the same view with the scientists
   2. B.
      is uncertain of its occurrence
   3. C.
      rejects it as being ungrounded
   4. D.
      thinks that it will destroy the world soon
3. 3.

   The underlined word “offset" in Para. 2 could best be replaced by______.

   1. A.
      slip into
   2. B.
      make up for
   3. C.
      set up
   4. D.
      catch up with
4. 4.

   This passage is mainly concerned with ______.

   1. A.
      the greenhouse effect
   2. B.
      the burning of fossil fuels
   3. C.
      the potential effect of air pollution
   4. D.
      the possibility of a new ice age

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels（coal and oil） creating a greenhouse effect-holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature-a result that would be equally disastrous（災(zāi)難的）. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do riot know for sure that either of these conditions will happen（though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely）. Perhaps, if we very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

1．As pointed out at the beginning of the passage, people used to think that air pollution ______.

      A．caused widespread damage in the countryside

      B．a(chǎn)ffected the entire eastern half of the United States

      C．a(chǎn)lmost brought worldwide effect

      D．existed merely in urban and industrial areas

2．As far as the greenhouse effect is concerned, the author _____________.

      A．shares the same view with the scientists

      B．is uncertain of its occurrence

      C．rejects it as being ungrounded（無根據(jù)的）

      D．thinks that it will increasingly destroy the world soon

3．It can be inferred from the passage that                    .

      A．raising the world’s temperature a little would not do much harm to life on the earth

      B．lowering the world’s temperature a little would lead to agricultural disasters

      C．a(chǎn)lmost no temperature variations have occurred over the past decade

      D．the world’s temperature will remain stable forever

4．This passage is primarily concerned with              .

      A．the greenhouse effect in the world

      B．the measures to adjust the climate

      C．the potential effect of air pollution

      D．the measures to protect the environment

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy traffic. Today, we know that although these are the areas with the worst air pollution, the problem is actually worldwide. On several occasions (情形) over the past ten years, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major industrial and traffic center. In fact, the very climate (氣候) of the entire earth may be affected by air pollution. Some scientists feel that the increase of carbon dioxide in the air which comes from the burning of fossil fuels (化石燃料) , such as coal and oil is creating a “greenhouse effect” — holding in heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.

Another view, less widely held, is that increasing particulate matter (顆粒物) in the atmosphere is blocking sunlight and lowering the earth’s temperature ─ a result that would be equally full of danger. A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies (趨勢) will offset each other and the world’s temperature will stay about the same as it is now.

64. People used to think that air pollution ______.

       A. affected the entire eastern half of the United States

       B. had damaging effects on health

       C. existed only in urban and industrial areas

       D. caused widespread damage in the countryside

65. As far as the greenhouse effect is concerned, the author ______.

       A. is uncertain of its happening

       B. thinks that it will destroy the world soon

       C. refuses it as being ungrounded

       D. shares the same view with the scientists

66. The underlined word “offset” probably mean ______ in Chinese.

       A. 強化                     B. 抵消                  C. 并存                          D. 補償