C

                                   ★★★★★

            Big waves are very bad news indeed. History is full of examples of devastation(破坏)The biggest wave ever recorded was the one that hit Alaska in 1958,after a huge landslide (山崩) created a tsunami that peaked at 500 meters above sea level. That's not a misprint: It was more than twice as high as the :tallest building in Britain today — Canary Wharf Tower. Scientists know how high it was because the giant wave removed trees and soil from nearby mountains up to that :altitude.

           The Alaskan wave is believed to have been a tsunami caused by a landslide. Italy has been hit by as many as 67 tsunamis in the past 2 ,000 years,though none :of them was as devastating as the one that killed 230,000;people around the Indian Ocean in 2004.

           It's  useful to tell the differences between tsunamis, which are caused by geological events,and enormous waves generated by weather. But it is probable that both types will become a lot more common as a result of worldwide global warming. The oceans absorb more than 80 percent of the heat added to the climate system. As the waters heat up,wind speeds increase,storms become more violent,polar ice melts,and sea level rises.

           “Now is the time to prepare for great floods,” Lloyd, an editorial in New Scientist,advised. ”In the future,the UK's  coastal cities will be jn jeopardy due to rising sea levels,” reported Lloyd. Similarly,nine out of the world's ten largest cities are located on low-lying coastal land.

            But giant waves are not new. For centuries,sailors told of the existence of enormous waves up to 100 feet high that could appear without warning in mid-ocean and often in perfectly clear and calm weather. Researchers : had reservations until the' existence of extremely huge waves was confirmed in 1995 in Norway,where an : 84-foot wave occurred in the sea where the average of the : tallest 33 percent of waves was 39 feet.

9. How did scientists determine the height of the Alaskan wave?

   A. By comparing it with Canary Wharf Tower.

   B. By observing the damaged mountains.

   C. By watching it from a tall building.

   D. By studying the huge landslide.

10. According to the text,more giant waves will be caused by .

Ai tsunamis   B. landslides

   C. climate change   D. rising sea levels

11. The underlined words “in jeopardy” in Paragraph 4 probably mean .

   A. in place   B. in peace

   C. in danger   D. in control

12. What can we infer from the last paragraph?

   A. Giant waves are less common recently.

   B. The biggest wave ever recorded was in Norway.

   C. Enormous waves appear with warning in the ocean.

   D. Researchers had doubts about huge waves before 1995.

二、完形填空(共20小题)

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D) 中,选出可以填入空白处的最佳选项。

               It was a hot June day in the suburb of Austin,Texas. Sammy Armstrong couldnt 21 to get in the water. The ten-year-old was on a camping trip at McKinney Falls State Park with his dad,Stacey,and his brother Willy.

               Around 11 a.m., Sammy and Willy 22 their dad to McKinney Falls. Below is a swimming hole, 20  feet deep in some places. With his father 23 from the rocks above,Sammy jumped in. He was a good 24 . he'd  been on the swim team in his hometown. Stacey watched them very carefully. Sammy played in the water for a while,and 25 pulled himself out of the swimming hole and onto a stone. He watched a group of 26 walking through the river bed above. As those children 27 Stacey and Willy,a tiny girl reached down to catch a water bottle and lost her 28 . In an instant,she fell into the falls.

                Sammy caught a glimpse of the top of the girl's 29 and her arms as she 30 in the deep water. Stacey walked toward the edge of the waterfall to try to locate the girl, 31 Samnly was the one in striking distance. “You have to get her out of there!” Stacey yelled at him. Sammy was 32 ,but “my dad just looked at me,and I understood what I had to do."

                Years in the Scow以(男重子军) had 33 Sammy never to enter a(n) 34 situation without an exit strategy. The ten-year-old considered the situation briefly,and then he 35 . In a few seconds,he was 36 the struggling girl. He tried to stay 37 ,but his heart was beating wildly. He asked the girl if she could swim. When she said no,Sammy 38 pulled her onto his back and moved toward the 39 . Soon,someone threw a swimming float from the bank and 40 both kids from the water.

21. A. wait   B. stop   C. expect   D. pretend

22. A. drove   B. accompanied   C. left   D. sent

23. A. missing   B. searching   C. shaking   D. watching

24. A. racer   B. hunter   C. swimmer   D. runner

25. A. nearly   B. naturally   C. secretly   D. eventually

26. A. sailors   B. children   C. guards   D. fishermen

27. A. passed   B. helped   C. observed   D. trained

28. A. interest   B. balance   C. direction   D. sight

29. A. legs   B. feet   C. belly   D. head

30. A. walked   B. played   C. struggled   D. turned

31. A. if   B. unless   C. though   D. but

32. A. sick   B. nervous   C. upset   D. angry

33. A. taught   B. changed   C. forced   D. controlled

34. A. political   B. relaxed   C. dangerous   D. embarrassing

35. A. grew up   B. gave up   C. stood back   D. dived in

36. A. next to   B. beyond   C. over   D. under

37. A. warm   B. calm   C. frightened   D. active

38. A. carefully   B. hardly   C. proudly   D. frequently

39. A. rope   B. bottom   C. shore   D. boat

40. A. found   B. checked   C. pulled   D. separated

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