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【多选题】
关于尿路结石的病理，下列说法正确的是（）。A.
绝大多数输尿管结石继发手肾结石
B.
可引起尿路梗阻
C.
不会引起恶性变
D.
尿路梗阻和感染可促发结石形成
E.
损伤黏膜导致血尿
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反馈参考答案：
举一反三
【单选题】—Did you play cards yesterday? —________ [ ]
A.
Yes, I play cards with my friends.
B.
Yes, I played cards with my friends.
C.
Yes, I am playing cards with my friends.
【简答题】_______play in the street! A car may hit you.
【简答题】A．Sleep at the campground. B．Play a card in their car. C．Return home after the rain stopped. D．Stay at a hotel at the foot the mountain.
【单选题】We'd better _______on the road. A car may hit us.
A.
not to play
B.
not play
C.
to not play
D.
don't play
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