The basic causes are unknown, although certain conditions that may lead to cance

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问题 The basic causes are unknown, although certain conditions that may lead to cancer have been______.(2011年四川大学考博试题)

选项 A、identified
B、guaranteed
C、notified
D、conveyed

答案 A

解析在给出的选项中：identified“辨认，辨别”；guaranteed“保证，确保”；notified“通知”：conveyed“传达”。本句意为“尽管人们已经识别出可能导致癌症的某些条件，但是对根本原因仍一无所知”。根据句意和各个选项的意思可知，正确答案是A。

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