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.
参考答案：A
解析：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。
| 书面表达。 假如你是某中学学生李华。最近，你班同学正在参加21世纪英文报“大家谈”栏目的一个讨论。本次话题为：“父母有没有必要陪读？” 请你根据下表所列情况给报社写一封信，客观地介绍讨论的情况。
2. 词数100左右。 3. 参考词汇：陪读 accompany sb studying at school 督促 urge | ||||
| Dear editor, I'm writing to tell you about the discussion we recently had about whether our parents should accompany us studying at school. ____________________________________________________ ________________________________________________________________________________ |