The conference has been held to discuss the effects of tourism _______ the wildlife in the area.

A．on

B．in

C．at

D．of

测得初孕妇坐骨结节间径7cm．出口后矢状径7cm，现妊娠39周，估计胎儿约3200g，宫缩正常，宫口开大2.5cm．正确的分娩方式应为（）。

A.自然分娩

B.会阴侧切，经 * * 分娩

C.产钳术

D.剖宫产术

E.胎头吸引术