共用题干 Why India Needs Its Dying VulturesThe 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 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 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)wilddogs 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 l980s in India. A population survey at that time showed that the three species of vultures had declined___________(64)over 90 percent. All three species are now listed as"critically endangered".As most vultures lay only single eggs and ___________(65)about five years to reach maturity,reversing their population decline will be a long and dif- ficult exercise. _________(51)
A.increase B.threat C.risk D.decline正确答案D
