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Some of the flu, such as headache and ac...

Some     of the flu, such as headache and aching muscles are often caused by poisonous products.

A. systems    B. symptoms

C. customs    D. bottoms

 

B 【解析】考查名词词义辨析。system系统,体系;symptom症状;custom风俗;bottom底部。句意:感冒的一些症状,比如头疼和肌肉疼,往往都是由毒产品造成的。根据句意,B选项正确。  
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