What do the underlined words“a grey area”in paragraph 2 refer to?

A．The discovery of unknown chemicals．

B．Viruses in a state of living and not living．

C．A difficult question unsolved about viruses．

D．The colour of viruses between black and white．

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参考答案

答案解析

推理题。题干意为“第二段中划线词组a grey area指的是什么?”。由文章第二段可知，科学家们总是把有生命和无生命的物体视作是截然相反的两者。随着病毒的发现，他们开始意识到在之前的两者之间还有一个中间的领域，它并不属于任何一方。所以这里的a grey area(灰色领域)指的是病毒处于一种生命体与非生命体的中间地带。故B为正确答案。

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3 One use ofthe London Pass is to __________．

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