A．search

　　B．resources

　　C．research

　　D．experience

　　解析：句意：科学家在能够理解和找到一个治愈办法之前需要做大量的调查和实验，do research做调查，为固定搭配。

　　答案：C

　　Ⅳ.阅读理解

　　A

　　Thousands of dead red­winged blackbirds fell from the sky in an Arkansas town on New Year's Eve after massive injuries，tests by Arkansas officials concluded on Monday.Some 5,000 birds mysteriously fell from the sky in Beebe，Arkansas after dark on New Year's Eve.“The birds suffered from acute physical injuries leading to internal hemorrhage (出血) and death.There was no sign of infectious disease，”the Arkansas Game and Fish Commission said in a statement.The birds were otherwise healthy，it said.

　　One theory is that birds were frightened by New Year's fireworks and flew into buildings or other objects.“Loud noises were reported shortly before the birds began to fall from the sky，”the statement said，adding that blackbirds have poor night vision and seldom fly at night.

　　Another theory was that severe weather such as lightning accounted for the loud noises but this was discounted because the violent weather had already left the area.“We're leaning more toward a stress event，”said the Arkansas Game and Fish Commission spokesman Keith Stephens.

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