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    【题目】The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.

    A. untilB. because

    C. thoughD. unless

    【答案】B

    【解析】

    考查连词。句意：这个科学家研究自然不是因为这样做有用。他研究自然是因为他从中会得到快乐。A. until直到；B. because因为；C. though尽管；D. unless除非。由下一句提示可知，本句为because引导的原因状语从句。故B选项正确。

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