6．Our math teacher is always ready to help us and asking for nothing _________．（　�。�
A．in turnB．in returnC．in caseD．in addition

分析 我們數(shù)學(xué)老師總是樂(lè)于幫助我們，不求回報(bào)．

解答 答案：B．根據(jù)句意，ask for nothing不要求任何東西，而in return為回報(bào)，ask for nothing in return不求回報(bào)，故選B．A．in turn輪流地，C．in case萬(wàn)一，假使，D．in addition另外，還有，均不合題意．

點(diǎn)評(píng) 本題考查介詞短語(yǔ)的辨析，需要學(xué)生對(duì)介詞短語(yǔ)的固定搭配多加記憶和區(qū)分，根據(jù)句意選擇合適短語(yǔ)．

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