临床用于厌氧菌的系统与局部感染以及抗滴虫病的药物替硝唑的化学结构为（）.
A.A
B.B
C.C
D.D
E.E
参考答案：A
—You need to __________ more every day. It’s good for your _______.
—But I can’t get up early.
A．exercise; health
B．exercise; healthy
C．exercises; health
D．exercises; healthy
大量咯血是指24小时内咯血量( )
A．100ml以上
B．200ml以上
C．400ml以上
D．500ml以上
