问题
选择题
The scientist wrote down_____ series of things to do with______ nature, such as a blue sky.
A a, / B. a, the C. /, / D. /, the
答案
答案：A
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。