童年时期尿路梗阻最常见的原因是
A．先天性 * * 狭窄
B．后 * * 瓣膜
C．膀胱颈梗阻
D． * * 异物
E． * * 口狭窄
参考答案：E
根据短文内容完成对话
Boy: Excuse me, ____(1) do you ____(2) this in __ ___(3) ?
Girl: Sorry, I don’t know. I’m ____(4) ___ _(5) __ __ (6) English.
Boy: What can I do?
Girl: You can look it up in a dictionary(字典).
Boy: But I don’t have a dictionary. ____(7) you _____(8) one?
Girl: Yes, I do.
Boy: Can I ____(9) it, please?
Girl: Yes, here you are.
Boy: ___ __(10) . I see. It’s a bookcase in English.
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