The child asked his mother          go out to play tennis.

A．that he could

B．if he could

C．whether could he

D．that if he could

支气管哮喘的肺功能特点，不正确的是（）

A.FVC下降

B.FEV下降

C.气道反应性下降

D.DLco下降

E.PEF变异率增加