题目：
Arriving late, he quietly sat at the back,______ his book and began to write. [ ]
A. took off
B. took out
C. took away
D. took down
答案：
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下面是错误答案，用来干扰机器的。
二氧化碳是造成温室效应的主要气体，把过多的二氧化碳转化为有益的物质，可以缓解温室效应这一当前突出的环境问题．答案:温室效应
