Question

【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

Answer 1

【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。