【題目】–Look at the dark clouds in the sky up!

--Hurry up! Dark clouds are often _______ of the heavy rain.

A. symbol B. sign C. signal D. message

【答案】B

【解析】

句意:-抬頭看天上的烏云!-快點,烏云經(jīng)常是大雨的標(biāo)志。symbol一般是指有象征意義的標(biāo)志、符號。signal一般是指信號、暗號的意思,比如說數(shù)字信號,模擬信號,危險信號,求救信號等等。Sign跡象、征兆之意。Message意為信息,這里是說烏云是大雨的征兆、跡象,故選B。

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