对于喜酸植物来说，PH值越低，生长得越好。

What __________ they do?[ ]

A. are       

B. can       

C. does

He hardly hurt himself in the accident, _____? [ ]

A: doesn't he

B: didn't he

C: did he

D: does he

格鲁派的创立人是（）。

A.朗达玛

B.宗喀巴

C.八思巴

D.达赖

治安强制执行

关于肠扭转的病因哪项是错误的

A．肠系膜过长

B．肠系膜根部附着过窄

C．肠段内重量突然增加

D．肠管动力异常

E．肠系膜过短