Scientists are expected to carry out thoroughgoing studies to back up claim’s made concerning new drugs.

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问题 Scientists are expected to carry out thoroughgoing studies to back up claim’s made concerning new drugs.

选项 A、support
B、elevate
C、investigate
D、challenge

答案A

解析  画线词back up,在这里的意思是:依靠,支持;其近义词为A support。辨义:A support支持。辨义:通过语义判断,到分辨词汇可分辨义:A.elevate;B.提高;C.investigate调查; D.challenge挑战。故正确答案为A。
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