中医学"治未病"是指（）
A.未病先防
B.治标治本
C.既病防变
D.正治反治
E.标本兼治
参考答案：A, C
Some students play ________ football and some students play ________ piano
after school. [ ]
A. the, X
B. the, the
C. X, X
D. X, the
