用括号里的词的正确形式填空

1. Today, we saw the parades, all the_______(perform)wore______

(colour) clothes.

2. It was really_____________(cheer) to see the performance.

3. I saw many men smoking in public places today. I think it’s_____________ (polite). It’s ____________(harm) to not only the smokers but also others.

4. I was so_____________(care) that I lost my map on the way.

5. There was a long line of___________ (visit). The line seemed to be___________(end). We had to wait for a long time.

关于杂合子与纯合子的正确叙述是（）

A．两纯合子杂交后代都是纯合子

B．两杂合子杂交后代都是杂合子

C．杂合子自交的后代都是杂合子

D．纯合子自交的后代都是纯合子