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

A. until B. though C. because D. Unless

C

【解析】

试题分析:本题考查连词。句意为:这个科学家研究自然不是因为这样做有用。他研究它是因为从中得到了快乐。until直到……为止;though虽然;because因为;unless除非。由于后半句的because可知和前面形成对称关系。尤其要注意错误选项unless的选择,unless相当于if…not,如:You'll fail in French unless you work harder. 你要是不再加把劲儿, 法语就考不及格了.。故选C

考点:考查连词

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