女、34岁。右侧腹痛伴恶心，呕吐，发热二天。有闭经史，孕7+月。体检：T37.5℃。腹部膨隆，可触及妊娠子宫，宫底高度与孕周柙符，胎动正常。右侧脐旁压痛及反跳痛。

你认为选择手术治疗的理由是（）。

A.手术对胎儿无影响

B.妊娠期盆腔充血，炎症发展快

C.易引起门静脉炎

D.易引起阑尾周围脓肿

E.易引起癌变

F.易发生弥漫性腹膜炎；易发生穿孔；易导至流产和早产

The fact that firms can make more adjustments to production methods in the long run gives the firm:（）

A. the ability to quickly adjust output. 

B. a long-run supply curve that is steeper than its short-run supply curve.

C. a long-run supply curve that is more elastic than its short-run supply curve.