The basic causes are unknown, although certain conditions that may lead to cancer have been______.

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问题 The basic causes are unknown, although certain conditions that may lead to cancer have been______.

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

答案A

解析本题考查单词词义。A项意为“鉴定，识别”；B项意为“保证”；C项意为“通知，报告”；D项意为“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”，A项符合题意。

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