根据句意及中英文提示完成句子。

1. —Do you know who _____(发现)America?  

    —Columbus _____(哥伦布).

2. Autumn is the third          (季节)of the year.

3. The    _    _(温度)is very high today.

4. David is a  _____(勇敢的)boy.

5. How many_____ (狐狸)can you see in the picture?

6. His son is        _  (wake) at seven every morning.

7. The_____(population) of our city has been growing these years.

8. Now more and more people like to visit_____(nature) parks in China.

9. All the children had a _____(wonder) time in the new zoo last Sunday.  

10. It seemed_____(surprise) that there were so many strange animals in this zoo.

下列各项，不属引起再生障碍性贫血主要病因的是（）。

A.药物

B.接触化学毒物

C.病毒感染

D.饮食不当

E.电离辐射