急性牙槽脓肿排脓通道对根尖周组织破坏最小的是

A．根尖孔-根管内-龋洞

B．根尖周-骨髓腔-鼻腔

C．根尖周-骨膜下-粘膜下

D．骨髓腔-面部间隙-皮下

E．根尖周-骨髓腔-上颔窦

We are pleased to say that weare（）to supply you（）the goods you want.

A.of aposition，──

B.at aposition，──

C.in aposition，with

D.at aposition，with