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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(dāng)鈴聲響起來并且老師合上書本時(shí)，就是每個(gè)人都會(huì)站起來的信號(hào)。A. Signal信號(hào) ；B. chance機(jī)會(huì)；C. mark 標(biāo)記；D. Measure測量；根據(jù)句意可知，這是一個(gè)信號(hào)，故選A項(xiàng)。

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