下列结论：①两点确定一条直线；②直线AB与直线BA是同一条直线；③线段AB与线段BA是同一条线段；④射线OA与射线AO是同一条射线．其中正确的结论共有个．

题干

下列结论：①两点确定一条直线；②直线AB与直线BA是同一条直线；③线段AB与线段BA是同一条线段；④射线OA与射线AO是同一条射线．其中正确的结论共有（　　）个．

A：1

B：2

C：3

D：4

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C

①	What does Emma's father like to watch on TV?	____
②	How many pairs of basketball shoes does Emma's father have?	____
③	Where are the CDs?	____
④	How many tennis balls does Emma's father have?	____
⑤	What kind of food does Emma's father like?	____