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2014-02-25

The basic causes are unknown, although certain conditions that may lead to cancer have been __________

A．identified

B．guaranteed

C．notified

D．conveyed

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参考答案

A

答案解析

A。虽然确定了一些可能导致癌症的条件，但是本质的原因还是不清楚。
考查动词辨析。identify意为“确定，确认”；9Ilamntee意为“确保”；notify意为“通报”；convey意为“传达”，故A符合句意。

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