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4、  A

 Whenever there’s a coral reef, the chances are there are divers nearby.  Diving is one of the fastest-growing water sports in the world.  Among the world’s favorite diving sports are the northern edge of Australia’s Great Barrier Reef and the Maldives’ islands in the Indian Ocean.  There, there is enough underwater activity to satisfy the most demanding diver.

 B

   People have been skiing since 3000 BC, but the birth of modern skiing --- for pleasure rather than necessity --- only began in the late 19^th century.  Since then, winter’s top sport has become an industry.  European countries, especially those along the Alps are famous for their skiing spots.  Norway, France and Switzerland are good choices.  There you can enjoy plenty of exercise among the mountainous forests while breathing in the fresh air.  Within a couple of lessons, you will be gliding through the trees in style.

  C

   Many beautiful mountains are now linked by steel cables and ladders.  You can work your way up the kind of rocks that would otherwise be only fit for birds.  Besides the proper equipment, you often need a strong will.  Europe’s highest mountain, Mont Blanc at 4807 meters, is a common goal for climbers worldwide.

  D

   Have you been to Shanghai?  Did you climb the TV tower?  The tower is the highest in Asia, and the CN Tower is in Toronto.  Let’s view the city from the tower.  Most buildings in Toronto are not very high.  But the CN tower stands out among the buildings.  It is 553 meters high, the world’s highest tower.

 E

   In a zoo without bars, safaris are adventure in its purest form.  Out on safari, it is the animals who rule the land.  From jeeps, you can see the struggles of life and death in a variety of wildlife, such as elephants, lions, birds and snakes.

   The national parks in Africa are the perfect places for safaris.

  F

At first it all seems rather easy as you drift along with the water only occasionally reaching over the sides of your raft.  And then suddenly, you realize why they call it white-water rafting. 

First comes the dull, distant roar of rapids, then a wash of white water and finally the roller-coaster ride that turns you at top speed down the river.  The Bio-Bio River in Chile and the Colorado River in the US are among the finest white-water destinations.