—This is really lively party.There's a great atmosphere，isn't there?

—________.The hosts know how to host a party.(2013·山东，32)

A．Don't worry

B．Yes，indeed

C．No，there isn't

D．It all depends

胫骨中下1/3处骨折，愈合较慢的原因属于（）

A.两骨折段血供均减弱

B.两骨折段之一血供减弱

C.两骨折段血供完全丧失

D.两骨折段之一血供完全丧失

E.以上均不对