. In our class, when the bell rang and the teacher closed his book, it was a ______for everyone to stand up.
A．markB．chanceC．signalD．measure
C
詞義辨析。mark 標(biāo)志，符號；chance  機(jī)會，運(yùn)氣；signal  信號，暗號；measure測量；尺寸。句意：在我們班的，當(dāng)鈴聲響時，老師合上他的書，這對于每個人來說是一個起立的信號。故選C。
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