男性，55岁。弯腰搬重物时出现下腹痛，无肛门排便排气2天。既往有多年便秘和腹痛史。查体：全腹胀，左下腹压痛明显，未扪及包块，肠鸣音亢进。直肠指诊阴性。钡剂灌肠只能进入200ml，钡柱尖端呈“鸟嘴形”。最可能的诊断是（）。

A.小肠扭转

B.结肠肿瘤性梗阻

C.乙状结肠扭转

D.肠套叠

E.肠系膜血管栓塞

小题1:This book is not useful for today’s students.

This book is    ▲   for today’s students.

小题2: Mary has been in Hong Kong for a month.

Mary    ▲   Hong Kong a month ago.

小题3: In the past people thought the earth was flat.

People    ▲   to think the earth was flat.

小题4:The family didn’t have enough money to send her abroad.

The family couldn’t    ▲   to send her abroad.

小题5:There were about fifteen people in the room, and most of them were women.

There were about fifteen people in the room,    ▲   women.