已知l，m，n为互不重合的三条直线，平面α⊥平面β，α∩β=l，m⊂α，n⊂β，那么m⊥n是m⊥β的（　　）

按照玻尔理论，一个氢原子中的电子从半径为r_a的圆周轨道上自发地直接跃迁到一个半径为r_b的圆周轨道上，r_a＞r_b，在此过程中（    ）

从方框中选出适当的句子，完成对话，有两项为多余选项。

A：I have already finished reading it.

B：Who wrote it?

C：How many times have you read it?

D：So do I.

E：Have you finished it yet?

F：Is it far from here?

A：Hi, Mike! You're reading the novel again.

B：Yes, John. I've never been tired of it.

A：____.

B：Four times. Every time I read it I can learn something new.

A：Really? ____.

B：Mo Yan. I think he is a great Chinese writer.

A：____. He is also my favorite writer. Please let me have a look at it.

B：OK. Here you are.

A：Mike, what do you think of this novel after reading so many times?

B：____I haven't seen such a novel for long.

A：Where did you buy it?

B：In the Xinhua Bookshop.

A：I don't know where it is.____.

B：No, only 10 minutes' walk from here，next to the People's Park.

A：Oh，I see. I'm going there to get one, too. Thank you!

B：You're welcome!