根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑，选项中有两项为多余选项。
A: Good morning, Betty. You look so weak.     1   
B: It’s hard for me to breathe.     2   
A: How long have you been like this?
B: Since about two weeks ago.
A:    3  
B: There’s a chemical plant near our town, which produces such harmful gases that the air has been seriously polluted.
A:    4  Pollution has caused too many environmental problems recently. We’d better do something to prevent it from going like this.
B:    5  Shall we write a letter to the local government about the problem?
A: Good idea. Let’s put it into practice at once. But…now I suggest you go to see a doctor first.
B: Thank you. And maybe I’ll have to think about leaving this town and moving to a better place.

A. Why not see a doctor? B. What’s the matter? C. I have a different opinion. D. My chest hurts E. I can’t agree more. F. It sounds terrible. G. What happened?