Not until the mid-term approached ______

2008年7月1日是星期二，那么2008年7月16日是星期（    ）。

已知各顶点都在同一球面上的正四棱柱高为4，体积为16，则这个球的体积为______．

We communicate _____ each other _____ letter.[ ]

A. by; with        

B. by; by    

C. with; with    

D. with; by

When starting CPR on a drowning victim，you should（）.

A.start chest compressions before the victim is removed from the water

B.drain water from the lungs before ventilating

C.begin mouth-to-mouth ventilations as soon as possible

D.do not tilt the head back since it may cause vomiting

甘草配芫花属于

A．相须
B．单行
C．相杀
D．相恶
E．相反