中国人在2000年前就开始烧石油照明了。
A. 对
B. 错
Doing a puzzle is an excellent way to use your brain’s power of recall and association.
A. 对
B. 错
Strong links between good brain health and strong personal relationships haven’t been found so far.
A. 对
B. 错
What are you planning_______ (do) with them?
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