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    7．Theory（理论） is based on practice．

    分析 理论以实践为基础．

    解答 Theory 考查名词．根据句意：理论以实践为基础．theory是名词"理论"，又因为在句首，所以答案是Theory．

    点评 本题考查名词的词义辨析．名词词义辨析题一直都是高考考查的一个热点，它注重考查考生结合语境准确选用词语的能力．由于英语词汇丰富，且用法多变，考生掌握起来有较大难度，因此在平时应注意词汇的积累，理解词语的含义及其常见的习惯搭配，再联系句子所表述的意义和语境，选出正确的答案．

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