Part IV 完形填空

Cloze (10 points) choices marked A, B, C and D. Choose the best answer for each blank and mark your answer on the Answer Sheet. London on the Thames, yes; but London in the Sea? No, thank you! Yet this could happen before 2060, 46 steps are taken quite quickly, to prevent it. Asaresult of global warming, the sea level around the south east corner of England is 47 to rise by 54cms in just halfacentury! And scientists now say that many parts of London will be at serious risk 48 flooding by the sea within 50 years. It's not all of London that is in danger: just some parts to the east of the city. And they won't be under water 49 : just when there are very high tides. The low-lying suburbs beside the Thames in the East End of London are already 50 from high tides byamassive barrier that stretches right across the river; but 51 defenses will be needed along the banks of the Thames to protectalarger area to the north of the river, and further east. Of course, there have always been 52 very high tides. A thousand years ago, there were big floods around London; and in 1953, before the Thames Barrier was built, over 300 people lost their lives in "the big flood"; but today the dangers are bigger. There are more 53 , more roads, more infrastructure. In the past, people did not build in places of flooding. Today, in southeast England, land is so expensive, that people build everywhere even in places that are liable to be flooded. Scientists also say that climate change will 54 warmer and drier summers in the south east of England. This will cause major changes in vegetation, and several species of native 55 will not be able to survive. Wet in winter, hot in summer: will that be London in fifty years' time?

46. A besidesB unlessC in caseD so that
47. A extendedB exposedC expectedD examined
48. A byB inC fromD through
49. A all the timeB at the timeC at timesD from time to time
50. A prohibitedB protectedC preservedD prevented
51. A manyB muchC mostD more
52. A usualB occasionalC regularD rare
53. A personB humankindC individualsD people
54. A lead toB suffer fromC hold backD result from
55. A lifeB livesC wildlifeD wildlives