2. 外语
  3. According to the writer, the main problem to our environment today is ______. The passage is mainly about ______.

According to the writer, the main problem to our environment today is ______. The passage is mainly about ______.

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问题 According to the writer, the main problem to our environment today is ______.
The passage is mainly about ______.
选项 A、energy resources saving
B、environment protection
C、population control
D、air pollution
答案B
解析 本题询问这篇文章的主要内容是什么。由于全文是关于环境保护的问题，故选B。
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