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growers’ attempts to save them，and there were fears that the health of the plant would continue to deteriorate.
In the 1960s，scientists working in Barbados looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes，mixing genes from the more delicate，commercial type. ____(48)____This sugar cane is not yet ready to be sold commercially，but when this happens，it is expected to be incredible profitable for the industry.
____ (49)____Brazil，which produces one quarter of the world’s sugar，has coordinated an international project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.
Despite all the research，however，we still do not fully understand how the genes in sugar cane.____(50)____This gene is particularly exciting because it makes the plant resistant to rust, a disease which probably originated in India, but is now capable of infecting sugar cane across the world. Scientist believe they will eventually be able to grow a plant which cannot be destroyed by rust.
A Since the 1980s，scientists have been analysing the mysterious of the sugar canes genetic code.
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B Unfortunately，however，the plant started to become weaker and more prone to disease.
C The majority of the world’s sugar now comes from this particular commercial species.
D One major gene has been identified by Dr. Angellique D’Hont and her team in Montpeller，France.
E Eventually，a commercial plant was developed which was 5 percent sweeter than before，but also much stronger and less likely to die from disease.
F Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.
参考答案：46.C 47.B 48.E 49.F 50.D
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个最佳答案。
Why India Needs Its Dying Vultures
The vultures(秃鹰)in question may look ugly and threatening，but the sudden sharp decline in three species of India's vultures is producing alarm rather than celebration，and it presents the world with a new kind of environmental problem. The dramatic_____(51)_____in vulture numbers is causing widespread disruption to
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people living in the ____(52)_____areas as the birds. It is also causing serious public health problems _____(53)_____the Indian sub-continent.
While their reputation and appearance may be unpleasant to many Indians，vultures have _____(54)_____played a very important role in keeping towns and villages all over India (55). It is because they feed on dead cows. In India，cows are sacred animals and are _____(56)_____left in the open when they die in their thousands upon thousands every year.
The disappearance of the vultures has _____(57_____an explosion in the numbers of wild dogs feeding on the remains of these_____(58)_____animals. There are fears that rabies(狂犬症) may increase as a result. And this terrifying disease may ultimately(最终)affect humans in the region，_____(59)_____wild dogs are its main carriers. Rabies could also spread to other animal species，_____(60)_____an even greater problem in the future.
The need for action is _____(61)_____，so an emergency project has been launched to find a solution to this serious vulture problem. Scientists are trying to _____(62)_____the disease causing the birds’ deaths and，if possible，develop a cure.
Large-scale vulture _____(63)were first noticed at the end of the 1980s in India. A population survey at that time showed that the three species of vultures had declined _____(64)over 90 per cent. All three species are now listed as \endangered\
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years to reach maturity，reversing their population decline will be a long and difficult exercise.
51. A increase B threat C decline D risk
52. A small B different C same D safe
53. A above B with C across D through
54. A rarely B long C recently D seldom
55.A dangerous B clean C smelly D beautiful
56. A immediately B occasionally C hardly D traditionally
57. A acted as B led to C come from D slowed down
58. A dead B strange C wild D endangered
59. A when B so C whether D since
60. A improving B causing C predicting D finding
61. A frequent B regular C urgent D sudden
62. A identify B prove C test D check
63. A injuries B deaths C arrivals D attacks
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64. A in B on C along D by
65. A waste B consume C take D adopt
参考答案：CC * BB DBADB CABDC
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