【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
在线课程【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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