急需英语有关民航方面的3~4人场景对话~！~

global warming
A． Class begins, good afternoon everyone.
B． C. D ：Good afternoon, teacher.
A. First, I will ask you a question: What is the serious problem nowadays ?
B. I think it’s the problem of environment pollution.
A. It’s related to our correct answer. But it isn’t correct one.
B. Is it the problem of population increasing?
A. No.
C. Oh. I got it. It’s global warming.
A. Right! Global warming is one of the serious problems nowadays. Because……
B. Teacher. I have a question. It was very cold indeed this winter. I think it’s global cooling!
A. You got the wrong concept. Global warming doesn’t only mean that the weather is getting hot, but also mean that the weather is out of control. So it will be sometimes very cold.
B. Teacher. What causes “ global warming”?
C. I know. Now people drive too many cars and the exhaust gases discharged by the cars and lorries pollute the air and also destroy the nature. It causes gl