Which of the following is the smallest in size?

A．Viruses．

B．New filters．

C．Living cells．

D．Chemical molecules．

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答案解析

推理题。题干意为“以下几个选项中，哪个是尺寸最小的?”。根据文章倒数第二段最后一句“…larger than the largest chemical molecules and smaller than the smallest living things．”可知，通过三者的比较，应该是chemical molecules最小。故D为正确答案。

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1 根据下面资料，回答题。
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