干姜人参半夏丸中含有（）
A.生姜汁
B.生姜
C.吴茱萸
D.白蜜
参考答案：A
一个长方形的周长是C，长是a，宽是（ ）
A．C-a
B．C÷2-a
C．C-2a
D．（C-a）÷2
Seldom______computer games ever since he entered college.
A．did he play
B．has he played
C．he played
D．he has played
