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外语
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
admin
2015-09-30
33
问题
The basic causes are unknown although certain conditions that may lead to cancer have been
选项
A、identified
B、guaranteed
C、conveyed
D、notified
答案
A
解析
identify“识别，鉴别”；guarantee“保证”；convey“运送；传达”；notify“通知”。题句意为：“虽然导致癌症的某些条件已经鉴别出来，但是根本的原因还不得而知。”
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