【題目】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】考查名詞詞義辨析。system系統(tǒng)，體系；symptom癥狀；custom風(fēng)俗；bottom底部。句意：感冒的一些癥狀，比如頭疼和肌肉疼，往往都是由毒產(chǎn)品造成的。根據(jù)句意，B選項(xiàng)正確。

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