. Emergency line operators must always ________calm and make sure that they get all the information they need to send help.
A．growB．a(chǎn)ppearC．becomeD．stay
D
詞義辨析。A. 生長 B. 出現(xiàn)  C. 變成   D. 堅(jiān)持；停留。句意：緊急線路操作員必須一直保持冷靜并確信他們得到了所有需要發(fā)送的幫助信息。故選D。
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