As a salesman, he works on a(n) ______ basis, taking 10% of everything he sells.
A. income
B. commission
C. salary
D. pension
呕吐的基本病机是A．肝气犯胃，胃气上逆（）
A. 肝气犯胃，胃气上逆
B. 胃失和降，胃气上逆
C. 食滞伤胃，胃失和降
D. 外邪犯胃，胃失和降
E. 脾胃受损，胃失润降
痰湿中阻导致的眩晕，其最佳选方为
A. 苓桂术甘汤
B. 半夏白术天麻汤
C. 涤痰汤
D. 三子养亲汤
E. 滚痰丸
My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all right"
A. must be
B. must have been
C. had been
D. had to be
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