域名后缀.edu表示_________

A. The fever has gone, but I'm still feeling weak.
B. Don't worry. Everything will be OK.
C. I know what you mean.
D. I'm having trouble breathing.

A. Is it serious, doctor?
B. I can't concentrate（集中注意力） in class.
C. The trouble is that I can't afford to be sick right now. 问题是我现在不能得病。
D. I have lost a lot of weight. 我已经减掉很多斤了。

A. Three times.
B. Three tablets a day.
C. Before a meal.
D. One tablet at a time.

A. You have got the flu.
B. You should make more friends.
C. You need to stay in bed for three days.
D. Your illness is very serious.