题目内容

She shouldn't have stood in a queue; she ____ her underground ticket from the machine.

A. has got
B. must have got
C. could have got
D. got

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Such a difficult operation may not succeed, it’s a（n)____ gamble.

A. essential
B. fundamental
C. elementary
D. inevitable

刮板运输机的机头在安装时必须摆正（)

引起肾前性急性肾衰的原因是（)。

A. 急性肾炎
B. 肾血栓形成
C. 休克
D. 水中毒
E. 尿路阻塞

引起肾前性肾功能衰竭的原因是（)。

A. 心力衰竭
B. 休克
C. 急性肾炎
D. 肝硬化
E. 膀胱肿瘤