第5部分：补全短文(第46～50题，每题2分，共10分)
下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。
Don’t Rely on Plankton to Save the Planet
Encouraging plankton growth in the ocean has been touted by some as a promising way to remove carbon dioxide from the atmosphere. 46
Adding iron to patches of ocean can make plankton bloom temporarily. The microscopic organisms suck up dissolved carbon dioxide from the water, which in turn is replaced by carbon dioxide from the air. 47
Jorge Sarmiento from Princeton and his colleagues developed a complex computer model to analyse how factors such as ocean chemistry and water circulation would affect the process if 160,000 square kilometres of ocean were seeded with iron for a month. 48
In their scenario, which covers an area 10 times as big as the largest experiment of this kind ever proposed, fertilising the ocean removes 1 million tonnes of carbon from the atmosphere — just 0.2 per cent of the carbon dioxide humankind spews out each month.
Rough estimates in the past have predicted similarly disappointing results. 49 says Sallie Chisholm, an environmental engineer from the Massachusetts Institute of Technology. “ But the take-home message is the same. 50 ”
A. Its opponents argue, however, that it will stop global warming.
B. Its opponents fear that it will damage the marine ecosystem, and now a computer model shows that the trick would also be remarkably inefficient.
C. As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed.
D. They found that 100 years later only between 2 and 11 percent of the extra carbon that was originally taken up by plankton had actually been removed from the atmosphere.
E. “These are newer and better models.” F Ocean fertilisation is not the answer to global warming.
第6部分：完形填空(第51～65题，每题1分，共15分)
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
Singing Alarms Could Save the Blind
If you cannot see, you may not be able to find your way ______ (51) of a burning building—and that could be fatal. A company in Leeds could change all that with directional sound alarms capable of guiding you to the exit.
Sound Alert, a company ______ (52) the University of Leeds, is _______ (53) the alarms in a residential home for blind people in Sommerset and a resource centre for the blind in Cambria. _______ (54) produce a wide range of frequencies that enable the brain to determine where the ______ (55) is coming from.
Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be ______ (56) by humans. “It is a ______ (57) of white noise that people say sounds like static on the radio,” she says. “Its life-saving potential is great.”
She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their way out of a large ______ (58) room. It ______ (59) them nearly four minutes to find the door ______ (60) a sound alarm, but only 15 seconds with one.
Withington studies how the brain ______ (61) sounds at the university. She says that the source of a wide ______ (62) of frequencies can be pinpointed more easily than the source of a narrow band. Alarms _____ (63) the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to indicate whether people should go up ____ (64) down stairs. They were ____ (65) with the aid of a large grant from British Nuclear Fuels.
51. A in B out C behind D under
52. A run by B changed by C decorated by D criticized by
53. A installed B installs C installing D had installed
54. A Alarms B Alarm C The alarm D The alarms
55. A noise B sound C music D bell
56. A watched B produced C learnt D heard
57. A amount B lot C burst D deal
58. A smoked B smoke-filled C filled with smoke D smoke-filling
59. A has taken B takes C took D will take
60. A on B near C without D from
61. A processes B produces C possesses D proceeds
62. A range B lot C variety D band
63. A basis on B base on C basing on D based on
64. A or B and C but D otherwise
65. A developed B determined C discovered D delivered
