红细胞不具有______。
A．运输O2和CO2的能力B．较强的缓冲能力C．止血和凝血能力D．渗透脆性E．悬浮稳定性
参考答案：C
She didn’t ask her boyfriend to buy her a car. ______, she bought one for him.
A．That is
B．On the contrary
C．To be honest
D．Generally speaking
人类两种最基本状态是（）。
A.觉醒、睡眠
B.呼气、吸气
C.进食、排泄
D.睁眼、闭眼
E.健康、生病
