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  3. Why India Needs Its Dying Vultures The vultures(秃鹰)in question may look ugly and threatening, but the sudden sharp decline i

Why India Needs Its Dying Vultures The vultures(秃鹰)in question may look ugly and threatening, but the sudden sharp decline i

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问题                     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【C1】______in vulture numbers is causing widespread disruption to people living in the【C2】______areas as the birds. It is also causing serious public health problems【C3】______the Indian subcontinent.
    While their reputation and appearance may be unpleasant to many Indians, vultures have【C4】______played a very important role in keeping towns and villages all over India【C5】______. It is because they feed on dead cows. In India, cows are sacred animals and are【C6】______left in the open when they die in their thousands upon thousands every year.
    The disappearance of the vultures has【C7】______an explosion in the numbers of wild dogs feeding on the remains of these【C8】______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,【C9】______wild dogs are its main carriers. Rabies could also spread to other animal species,【C10】______an even greater problem in the future.
    The need for action is【C11】______, so an emergency project has been launched to find a solution to this serious vulture problem. Scientists are trying to【C12】______the disease causing the birds’ deaths and, if possible, develop a cure.
    Large-scale vulture【C13】______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【C14】______over 90 per cent. All three species are now listed as "critically endangered". As most vultures lay only single eggs and【C15】______about five years to reach maturity, reversing their population decline will be a long and difficult exercise.
【C9】
选项 A、when
B、since
C、so
D、whether
答案B
解析 句意为：这一可怕的疾病最终会影响该地区的人们，——野狗是主要的载体。由此可知，前后分句存在因果关系。四个选项：when“当…时候”；since“因为”；so“所以”；whether“是否”。
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