欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

5、 

When Christmas time is upon us, there won't be many families without some type of Christmas tree. Most will choose between a cut pine tree and an artificial plastic tree.

Artificial Christmas trees are usually made from steel and the plastic known as PVC. To produce one kilogram of raw PVC you need over a kilo of fossil fuels plus half a kilo of minerals and 10 L of water. The process also releases about two kilograms of CO₂ ― which contributes to climate change ― and eight grams of dangerous waste.

Most live Christmas trees come either from small plantations dedicated to growing trees just for Christmas or are the rejects from large pine plantations. In both cases, the growing trees provide some long-term soil protection and suck up climate-change-causing carbon dioxide from the atmosphere. However, the use of fertilizers and pollution from machinery can have negative impacts on the local ecosystems.

Both types of trees require transportation to reach your home, which means fuels are burnt and air pollution generated. The greater the distance travelled, the larger the impact, and plastic trees certainly rack up the kilometres. The vast majority of Australia’s artificial trees are made in factories in Asia. If a family in Melbourne buys a plastic tree made in China, then it has travelled more than 8,000 km to arrive at its new home. Alternatively, someone living near Melbourne's CBD could get a real tree from a plantation less than 50 km away.

Despite the shorter life span, real trees are the way to go, because a natural tree can be reused in its afterlife. A plastic Christmas tree can’t be recycled and that means its final resting place will be the local dump. Here the PVC will stay in much the same form for thousands of years.

72. Which of the following is NOT TRUE according to the passage?

      A. Artificial Christmas trees are usually made from steel and plastic.

B. The process of producing PVC does great harm to the environment.

C. Real Christmas trees usually come from large or small plantations.

D. Real Christmas trees release much carbon dioxide while growing.

73. By saying “rack up the kilometres”, the author probably means that the transportation of plastic trees _______.

A. is more convenient                         B. produces more pollution

C. covers a shorter distance                D. can save more fuels

74. According to the passage, real Christmas trees _______ compared with fake ones.

A. use fewer resources                       B. are more difficult to recycle

C. last much longer                             D. are less expensive

75. Which of the following is the most suitable title for this passage?

A. Real Christmas Trees: A Wasteful luxury

B. Fake Christmas Trees: A Economical Choice

C. Real Christmas Trees: A Greener Decision

D. Fake Christmas Trees: A Popular Trend