填空题

Dolphins do not have a communication system of their own.

【参考答案】

N

<上一题目录下一题>

热门试题

填空题

It is proved that monkeys have the ability to combine and to generalize the sign language.

问答题

假定你是一名校报编辑，由于校报的快速发展需要招聘新的学生记者，请你根据此内容拟一则招聘广告。