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问题 单项选择题

肾盂肾炎最常见的感染途径是（）

A.外伤性感染和血源性感染

B.上行性感染和血源性感染

C.外伤性感染和输血感染

D.医源性感染和外伤性感染

E.多途径感染

答案

参考答案：B

选择题

— Who did it sound like? Anybody you know?

— Well, perhaps Jeff. I ____ who was calling before he hung it up. [ ]

A. must have asked

B. needn't have asked

C. couldn't have asked

D. should have asked

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多项选择题

现代汉语常用的记音符号有（）。

A、反切

B、注音字母

C、《汉语拼音方案》

D、国际音标
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