【題目】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

【答案】C

【解析】試題分析:本題考查連詞。句意為:這個科學家研究自然不是因為這樣做有用。他研究它是因為從中得到了快樂。until直到……為止;though雖然;because因為;unless除非。由于后半句的because可知和前面形成對稱關(guān)系。尤其要注意錯誤選項unless的選擇,unless相當于if…not,如:You'll fail in French unless you work harder.你要是不再加把勁兒,法語就考不及格了.。故選C

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