【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(gè)科學(xué)家研究自然不是因?yàn)檫@樣做有用。他研究自然是因?yàn)樗麖闹袝玫娇鞓贰?/span>A. until直到；B. because因?yàn)椋?/span>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(xiàng)正確。

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