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 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 difficult exercise.

请在第__(51)__处填上正确答案。

A．increase

B．threat

C．risk

D．decline

52、请在第__(52)__处填上正确答案。

A．small

B．different

C．same

D．safe

53、请在第__(53)__处填上正确答案。

A．above

B．with

C．across

D．through

54、请在第__(54)__处填上正确答案。

A．rarely

B．long

C．recently

D．seldom

55、请在第__(55)__处填上正确答案。

A．dangerous

B．clean

C．smelly

D．beautiful

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