My friends __________ come to see me. I don’t want to go out in case they come.

A．can

B．must

C．may

D．will

儿童哮喘发作的先兆有（）。

A.出现哮吼声

B.呼气性呼吸困难

C.端坐呼吸

D.刺激性干咳

E.烦躁不安