通气改善率测定中提示气道阻塞中度可逆的标准是（）
A.10%
B.>15%
C.15%～24%
D.25%～40%
E.>40%
参考答案：D
新制橘皮竹茹汤功效与作用
—The radio is too noisy and there is nothing interesting on it. Why don't you ______?
—All right. I'll do that. [ ]
A. turn on it
B. turn it off
C. turn off it
D. turn it up
