How much one enjoys himself travelling depends largely on ________ he goes with, whether his friends

or relatives.[ ]

A. what  

B. who

C. how  

D. why

湿痰的特征是（）。

A.痰中带血，色鲜红

B.白而清稀

C.咯吐脓血腥臭痰

D.白滑而量多

E.少而黏稠