情景对话。

A: Good moring, Mr Green!

B: Good moring. What's your 1.               , please?

A: My name is Li Ming. 2.                 are you, Mr Green?

B: Fine, thanks. 3.                 you?

A: I'm fine, 4.                 Thank you.

B: What 5.                are you in?

A: I'm in Grade Two.

B: Are you in Class 3?

A: 6.                . I'm in Class 1.

B: How 7.                  are you?

A: I'm eleven.

B: 8.                 do you go to school?

A: By bike.

B: By the way, is this 9.                 key to the bike?

A: Yes, it's mine. Thank you.

B: You're 10.                .

关于二尖瓣狭窄的说法哪些是正确的（）

A.有的可行瓣膜成形术

B.咯血

C.是风湿性心脏病中最常见的瓣膜疾患

D.瓣口面积降低到1.Ocm²以下才出现临床表现

E.狭窄解除之前，在肺动脉高压时出现低血压应尽量少用纯α受体兴奋剂