2. 外语
  3. The main idea of the first paragraph is______. The passage is mainly about______.

The main idea of the first paragraph is______. The passage is mainly about______.

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问题 The main idea of the first paragraph is______.
The passage is mainly about______.
选项 A、nuclear weapons
B、biological weapons
C、chemical weapons
D、bio-chemical weapons
答案B
解析 主旨题。文章主要论述了二十一世纪生物武器发展方面有可能出现的情况。
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大学英语四级

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