如图，直线a，b都与直线c相交，给出的下列条件： ①∠1=∠7；②∠3=∠5；③∠1＋∠8=180°；④∠3=∠6．其中能判断a∥b的是

题干

如图，直线a，b都与直线c相交，给出的下列条件：

①∠1=∠7；②∠3=∠5；③∠1＋∠8=180°；④∠3=∠6．

其中能判断a∥b的是（　　）

A：①③

B：②③

C：③④

D：①②③

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D

Lucy	I like sports. I have ten tennis balls, seven basketballs, four volleyballs and five soccer balls. I play tennis with my friends every day.
Mary	I have five baseballs, five volleyballs, two soccer balls. I like ping-pong. It's easy for me. I often play ping-pong with my classmates. I also have three ping-pong bats and lots of ping-pong balls.
Alice	I don't have any balls. I love sports, but I don't play them. I only watch them on TV.