当机体处于感染或其他应激反应时，外周血中增加的粒细胞主要来自（）
A.分裂池
B.成熟池
C.贮备池
D.循环池
E.边缘池
参考答案：C
(2013·青岛一模)—I've got something weighing on my mind. Could you give me some advice?
—________. Tell me all about it and I'll do what I can.
A．Don't mention it
B．No way
C．No problem
D．Forget it
根据人类体质方面的特征，地球上人类可以分为______种______种______种三个主要人种．
