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

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 题干：致癌的基本原因还不清楚，尽管某些致癌因素已经得到确认。identify识别，认出；guarantee保证；notify通知：convey传导。根据题意，本题选A。
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