20. According to the passage, why is the shape of sea cucumbers important??
A. It helps them to digest their food.?
B. It helps them to protect themselves from danger.?
C. It makes it easier for them to move through the mud.?
D. It makes them attractive to fish. ?
21. The fourth paragraph of the passage primarily discusses ?____?.?
A. the reproduction of sea cucumbers?
B. the food sources of sea cucumbers?
C. the eating habits of sea cucumbers?
D. threats to sea cucumbers existence ?
22. What can be inferred about the defence mechanisms of the sea cucumber??
A. They are very sensitive to surrounding stimuli.?
B. They are almost useless.?
C. They require group cooperation.?
D. They are similar to those of most sea creatures. ?
23. Which of the following would NOT cause a sea cucumber to release its
internal organs into the water??
A. A touch.
B. Food.?
C. Unusually warm water.
D. Pollution.
答案和解析:
20. B)通过阅读文章可以排除选项A、C、D,因为文中没有提及,故选项B为正确答案。?
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