当人受轻伤流血时，能自动止血，其凝血作用的是[ ]
A．白细胞
B．血红蛋白
C．血小板
D．浓缩的血浆
答案：C
________ away from school for two weeks, I have quite a few lessons to catch up with.
A．Having been
B．To be
C．Been
D．Being
发现脂肪瘤即需手术切除。()
