2. 外语
  3. What does the passage mainly discuss? The purpose of the "guncotton" mentioned in paragraph 2 was to

What does the passage mainly discuss? The purpose of the "guncotton" mentioned in paragraph 2 was to

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问题 What does the passage mainly discuss?
The purpose of the "guncotton" mentioned in paragraph 2 was to
选项 A、trap particles for analysis
B、slow the process of putrefaction
C、increase the airflow to the microscopic slide
D、aid the mixing of alcohol and ether
答案A
解析
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