从下列每组A、B、C、D四个选项中，选择一个与句中划线部分意思相同或相近的答案。

1. Nice to meet you. 　　

A. have

B. hear

C. see

D. listen to 

2. This question is not easy. 　　

A. dark

B. large

C. quiet

D. difficult

3. She does well in English. 　　

A. is afraid of

B. is good at 　　

C. is full of

D. is ready for

4. At last, all the students in our class passed the exam. 　　

A. By the end

B. At the end 　　

C. In the end

D. To the end

5. —Excuse me, where is the nearest post office? 　　

    —Sorry. I have no idea. 　　

A. I don't tell you.

B. I don't know. 　　

C. I don't go there.

D. I don't think so.

早期的OS主要追求的是（）。

A.系统的效率

B.用户的方便性

C.可移植

D.可扩充性