◎ 题干
Mike _____ his computer and checked his e-mail.              
[     ]
A. turned on                
B. turned off              
C. turned up                
D. turned down
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Mike _____his computer and checked his e-mail. [ ]A. turned on B. turned offC. turned upD. turned down…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。