《素问•上古天真论》中女子五七发始堕的原因是（）
A、肾气虚
B、肾精亏
C、血不足
D、阳气衰于上
E、阳明脉衰
参考答案：E
—There is a hole in your bag?
—I know. I’m going to have it __________.
A．mend
B．mending
C．mended
D．to be mended
若⊙O1和⊙O2相切，O1O2 = 10，⊙O1半径为3，则⊙O2半径为___________．
