妊娠呕吐应首选（）
A.砂仁
B.竹茹
C.吴茱萸
D.生姜
E.半夏
参考答案：A
Yao Ming as well as his teammates ______ hard to win honor for China these years.
A．work
B．are working
C．has been working
D．works
应价
