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The basic causes are unknown, although certain conditions that may lead to cancer have been______. (北京航空航天大学2013年试题)
The basic causes are unknown, although certain conditions that may lead to cancer have been______. (北京航空航天大学2013年试题)
admin
2018-09-18
33
问题
The basic causes are unknown, although certain conditions that may lead to cancer have been______. (北京航空航天大学2013年试题)
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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