影响消毒灭菌效果的因素包括（）
A.处理剂量
B.微生物数量
C.温度和酸碱度
D.化学拮抗物质的存在
E.以上均是
参考答案：E
I often see the girls ________ in the room. They are very pleased.
A．dance
B．dances
C．dancing
D．to dance
单项选择。
Please look the screen and listen to me.[ ]
A. at
B. for
C. after
