18．In our class，when the bell rang and the teachers closed his book，it was a___________for everyone to stand up．（　　）
A．signalB．chanceC．markD．measure

分析 在我們班，當(dāng)鈴聲響起、老師合上書時，這就是每個人要起立的信號．

解答 答案是A；本題考查名詞辨析；signal（約定俗成的）信號；chance機會；mark 標志；記號；measure措施；根據(jù)句意可知打鈴及老師合上書本，這是下課的信號，故選A．

點評 辨析名詞要在識記常見名詞及其搭配的基礎(chǔ)上理解語境，根據(jù)具體語境推斷合理的答案．

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