— _____________ are these books?
— Thirteen yuan.[ ]
A. How many
B. What
C. How much
答案:C
正常人体血容量占体重
A.8-9%
B.18-19%
C.28-29%
D.38-39%
下面哪个不是Fireworks中的混合模式()
A、色彩繁殖
B、屏幕
C、差异
D、阴暗度