在沥青混凝土桥面铺装下，如另有一层混凝土底层时，应待底层的混凝土强度达到设计强度的9

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.

标志着北宋诗 * * 新运动最高成就的作家是（）

A.苏轼 

B.王安石 

C.范中淹 

D.欧阳修

患者男性，26岁，在寒冷天气易发生哮喘，诊断为内源性哮喘。

该药物的作用机制是该药（）。

A．阻断M受体

B．激动β₁受体

C．阻断D₂受体

D．增强GABA功能

E．激动吗啡受体

小儿扁桃体过度肥大可引起（）。

A.呼吸不畅

B.睡眠打鼾

C.刺激性咳嗽

D.吞咽阻挡感

E.言语缺乏共鸣

遇硫化氢泄露时应朝着什么方向逃生？