叙述并指出天柱、合谷、涌泉的定位。

If you want to read English quickly, you must learn _______ English words by heart as you can.      [ ]

A. as much                            

B. so much        

C. as many                          

D. so many

周保养主要由操作人员配合（）人员完成。

凸釉

献血法规定的献血年龄（）岁

A.18-55

B.16-55.

C.18-60.

D.16-20.