CRH1A型动车组“暂停乘客紧急制动”按钮（红色）（），表示乘客紧急制动手柄启动，按

I had a bad cold. The doctor asked me          in bed for a good rest. [ ]

A. staying  

B. stays      

C. stay       

D. to stay

Nowadays there are still a number of students        school at various grades due to a lack of money in

some poorer areas.[ ]

A. leaving out

B. making out

C. letting out

D. dropping out

在Word 2010中，不可以将文本框当作图形来处理

无病毒苗的培育法。