tRNA在发挥其功能时最重要的两个部位是（）

A.反密码子臂和反密码子环

B.氨基酸臂和D环

C.氨基酸臂和反密码子环

D.Tψ环和反密码子环

E.Tψ环和可变环

用所给词的适当形式填空。

1. Most people know Jackie Chan is a famous________.

2. What do you decide________ ( be) when you grow up?

3. My brother and I________ ( visit) my aunt near the sea in 1999.

4. March 8th is________ ( woman) Day.

5. At that time,we didn't have a car. We ________ ( travel)to Beijing by train.

6. They________ ( not use) computer or Internet at that time.

7. When they________ ( are) young,my parents didn't have bikes.

8. Please speak                       (loud).I can't hear you.