CT与X线照片比较，X线照片不易显示的病变是（）
A.骨折
B.异物
C.骨结核
D.骨肿瘤
E.软组织内出血
参考答案：E
As a Senior 3 student，if you want to get a good result，it is important to ___a good state of mind for the coming entrance examination．
A．keep up
B．carry out
C．keep off
D．keep out
试述精子的结构？
