下列哪一种物质不参与内源性凝血系统？（）
A.激活的Ⅻ因子
B.激活的Ⅹ因子
C.血小板因子3
D.Ⅴ因子
E.组织因子
参考答案：E
— Do you have any idea what Paul does all day?
— As I know, he spends at least as much time playing as he _____. [ ]
A. writes
B. does writing
C. is writing
D. does write
武则天是中国历史上唯一的女皇帝。 （ ）
