简述血液凝固的基本过程。
参考答案：其基本过程：①凝血酶原激活物形成（1分）；②因子Ⅱ转变为凝血酶（1分）；③因子Ⅰ转变为纤维蛋白（1分）。
---Who is that boy?
---- He is my .
A. father B. brother C. grandfather
It's well-known that Zhou Jielun is a singer is popular with the young. [ ]
A.whose
B.whom
C.who
D.which
