It is common sense that fever is a of the flu.

A．symbol B．symptom

C．signal D．sign

B

【解析】

試題分析：句意：發(fā)熱是感冒的癥狀，這是一個普遍常識。A. symbol象征；B. symptom癥狀；C. signal信號；D. sign跡象。故選B。

考點：考查名詞的詞義辨析。

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