The passage is mainly about. The fourth paragraph of the passage primarily discusses .

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问题 The passage is mainly about______.
The fourth paragraph of the passage primarily discusses ______.

选项 A、the reproduction of sea cucumbers
B、the food sources of sea cucumbers
C、the eating habits of sea cucumbers
D、threats to sea cucumber’s existence

答案C

解析从第四段中可以看出，海参虽有惊人的食欲，可以日夜进食，但也可以长时间节制进食或者根本就不进食。这样，海参赖以生存的海洋微生物便有机会繁衍下去。由此可见，C项为正确答案。

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