— I usually go to bed late at night. And you?

—          .

A．So I do

B．So do I

C．So am I

D．So I am

小儿易患气管异物的原因是

A．耳咽管较宽，短而呈水平

B．右支气管粗、短

C．肺含血量多，含气量少，易感染

D．婴儿胸廓呈桶状

E．以上均是