Write a note _____ a friend. [ ]
A. at
B. to
C. on
D. for
答案：B
—Would you like tea or coffee?
— is OK. I really don't mind. [ ]
A. None
B. Either
C. Neither
D. Both
清燥救肺汤中人参的作用有（）
A.补气
B.养肺
C.培土
D.生津
E.固脱
