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【題目】In our class,when the bell rang and the teacher closed his book ,it was a ________for everyone to stand up .

A. signal B. chance C. mark D. measure

【答案】A

【解析】

試題分析：考查名詞。句意：在我們的課堂上，當鈴聲響起來并且老師合上書本時，就是每個人都會站起來的信號。A. Signal信號 ；B. chance機會；C. mark 標記；D. Measure測量；根據句意可知，這是一個信號，故選A項。

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