—We're going to travel around the world.   — _______! [ ]

A. OK

B. That's true

C. Have a good time

D. That's nothing

与年长儿比较，婴幼儿上呼吸道感染的临床特点为（）

A.以消化道症状为主

B.以呼吸道症状为主

C.以鼻咽部症状为主

D.全身症状轻

E.全身症状较重