【題目】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】

考查連詞。句意：這個科學(xué)家研究自然不是因為這樣做有用。他研究自然是因為他從中會得到快樂。A. until直到；B. because因為；C. though盡管；D. unless除非。由下一句提示可知，本句為because引導(dǎo)的原因狀語從句。故B選項正確。

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