呕吐实证常见的证型有（）
A.肝气犯胃
B.脾胃虚弱
C.饮食停滞
D.外邪犯胃
E.痰饮内停
参考答案：A, C, D, E
After much _____ the shop owner agreed to cut down the price by 20% . [ ]
A. debating
B. talking
C. discussing
D. bargaining
中等强度作业时供氧情况是
A．氧需不超过氧上限B．氧需超过氧上限C．几乎是在无氧条件下D．氧需等于氧上限E．B和D
