Questions 14-17 The text has 9paragraphs (A-I). Which paragraph does each of the following headings best fit? *

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问题 Questions 14-17
The text has 9paragraphs (A-I).
Which paragraph does each of the following headings best fit?

*

选项 A、nutrient levels depended on the number of organisms that eat carbon.
B、certain viruses keep microbe levels under control.
C、bacteria might be responsible for climate change.

答案A

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