大面积砍伐森林可能引发的环境问题有（    ）

In England ,people don't often talk to each other when they travel. If you get on a bus or a train. you can see people sitting and looking out of the window. Other people may read books or newspapers.
When you meet English people, they often start a conversation by talking about the weather . So when you meet somebody in England, you can say, "Nice weather for the time of the year!"
"But it was a little cold yesterday, "somebody may answer.
"But it will get a bit warmer later,"you can say.
Talking like this, they will think,"How friendly you are!"