The scientist wrote down series of things to do with nature, such as a blue sky.A a, / B.

发布时间：2020-08-16 20:11:31

The scientist wrote down     series of things to do with     nature, such as a blue sky.
A   a, /         B. a, the       C. /, /           D. /, the

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解析：考查冠词的用法。a series of 一系列的，nature，space, society前不加冠词。句意：这位科学家写下了一系列与大自然有关的事情，比如蓝色的天空。故选A。
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