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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。?
21. C)此题为段落主旨题。通过阅读第四段可知作者都是讲述海参的进食习惯，故选项C为正确答案。?
22. A)此题为推论题。根据最后一段可知海参在受到外界刺激时，会做出一定的反应，这也反映出它的防御机制非常敏感，故A为正确答案。?
23. B)此题为细节题。根据最后一段可知惟有food不会使海参将体内器官吐出来，故其为正确答案。
n. 污染，污染物
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