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问题 单项选择题

口腔扁平苔藓的患病率约为

A．3.25%
B．20%
C．7.23%
D．0.51%
E．1.5l%

答案

参考答案：D

解答题
130×2=45÷5=48+22=24÷6=
25×8=56-9=49+18=49÷7=
400×5=45÷9=36÷6=76-28=
1-
2
5
=
2
7
+
5
7
=
6
9
-
4
9
=
3
8
+
2
8
=
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选择题

Please ask the salesgirl ____. 

A．how much did it cost

B．how much it costs

C．how much it costed

D．it cost how much
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