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When you are _______ about which button...

 When you are _______ about which button to press on the complicated machine, you can either read the user’s guide for guidance or fax us for specific instruction. Don’t ______ the trial-and-error method.

A.insure; do

B.ensure; make

C.uncertain; try

D.unsure; touch

 

C 【解析】 试题解析:insure确保;ensure使安全;uncertain不确定的,因缺乏了解而捉摸不定;unsure不确定的,缺乏准心的;make做;try尝试;touch触摸。句意是对于一个机器当你不确定按哪一个按钮时,你可以阅读使用向导,也可以传真我们说明,不要尝试实验错误的方法。故选C。 考点:词义辨析。
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