患者男，67岁，半日前间断呕血2次，量约20ml，无头晕、心悸，查体血压、心率正常，

对表达式for(表达式1；；表达式3)可理解为（ ）。

A．for(表达式1；0；表达式3)

B．for(表达式1；1；表达式3)

C．for(表达式1；表达式3；)

D．for(；；表达式3)

Don't forget this, kids. _         careful you are,              mistakes you will make.         [ ]

A. The more, the more        

B. The fewer, the more        

C. The more, the fewer

—What did she     for so much money.

—Nothing but a few CDs.

A．pay

B．spend

C．buy

D．prepare

Who did the teacher______ an article for the wall newspaper?[ ]

A. has write          

B. has written          

C. have write        

D. have written

．GK阀止回阀铜套松动、弹簧折损、衰弱、外弹簧托板变形或裂损更换，止回阀裂纹时更换。