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问题 单项选择题

召回方案有效性验证的办法包括（）

A.模拟召回

B.实际召回

C.挑战性实验

D.以上都是

答案

参考答案：D

选择题
I walked slowly through the market, where people _____ all kinds of fruits and vegetables. I studied the prices carefully and bought what I needed.

A. sell
B. were selling
C. had sold
D. have sold
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多项选择题

急性重型肝炎，下列描述哪些正确（）

A.黄疸迅速加深

B.明显出血倾向

C.肝脏逐渐肿大

D.急性肾功能不全

E.神经系统表现
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