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

A. systems B. symptoms

C. customs D. bottoms

【答案】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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