室内常见的生物性变应原是（）
A.蚊子
B.臭虫
C.尘螨
D.蟑螂
E.病毒
参考答案：C
桔梗汤3功效与作用
—How many computers are there in this room?
—_________. They are moved to another room. [ ]
A. Nothing
B. None
C. No
D. No one
