大多数水生动物不仅能自由地生活，而且能够快速地逃避敌害。下列各项中与鱼类防御敌害有关的是:

A．游泳

B．用鳃呼吸

C．捕食

D．体表有鳞片

There are some police cars in front. What do you suppose ____?

A．is the matter

B．is happened

C．is the wrong

D．the trouble is