慢性骨髓炎手术治疗的目的，下列错误的是（）
A.消灭窦道
B.取出大片状死骨
C.消灭死腔
D.关闭伤口
E.查明致病菌
参考答案：D
Whenever we hear of a natural disaster, we feel sympathetic to the people to be affected .
A．to have affected
B．to have effected
C．who have been effected
D．who have been affected
（）被广泛认为是继报纸、电台、电视之后的第四媒体。
A.互联网
B.电话
C.广播
D.手机
