18．It's good for us to drink milk ________ the morning．（　�。�
A．atB．onC．inD．from

分析 在早上喝牛奶對我們是有益的．

解答 答案：C．考查常用介詞的辨析．句意：在早上喝牛奶對我們是有益的．根據(jù)題干It's good for us to drink milk ________ the morning．可知表示在早上，下午都用介詞in，即in the morning在早上，固定用法．即在早上喝牛奶對我們是有益的．故選C．

點評 仔細分析句子的結(jié)構(gòu)，掌握一些固定用法，根據(jù)具體內(nèi)容作答．

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