基础知识。

1. There is a big football ________________(a place for people to play football) in my school.

Look, some boys are playing football there.

2. In China, the summer holiday usually ______ (结束) before September 1st.  

3. Do you often ________________(借) books from the library?

4. It is good for us to do morning ___________________(锻炼)every day.

5.Lucy thinks it is ________ (困难的)to learn English. But I don't think so.

髌骨骨折容易误诊的是：（）。

A.横形骨折

B.粉碎骨折

C.纵形骨折

D.星状骨折

E.撕脱骨折