单项选择题

The value of dolphins in military uses is inspired by______.

A．their buzzes
B．their quacks
C．their clicks
D．their squeals

<上一题目录下一题>

热门试题

填空题

It is one thing to communicate with your friends on the phone, but____________(完全是另一回事) to write a letter explaining the same ideas.

填空题

Stressful environments lead to unhealthy behaviours such as poor eating habits,____________(这进而增加了得心脏病的危险)