阅读理解。

     Do you have a brother or a sister? Do you have two tennis rackets and a tennis ball? You can play tennis.

Two people or four people can play tennis. Do you have a basketball? 　　

     Do you have two brothers or sisters? Can your mother and father play? Five people can play basketball. 　　     Volleyball needs six people for each team and a volleyball. But baseball needs a big family. A baseball team

has nine people. You need a baseball bat and a ball.

1. _____ people can play baseball and they need a _____ and a _____ _____.

2. _____ or _____ people can play tennis.

3. Five people can play _____.

4. _____ needs six people for_____ team and a _____.

慢性骨髓炎的手术适应症应是（）

A.反复有发烧及局部疼痛

B.局部有红、肿

C.局部压痛

D.病变骨质变粗、密度增高

E.有死骨且骨包壳充分形成