问题描述：
假设你是李华你的美国朋友chris给你发来e－mail询问你校正在开展低炭生活的活动,请写一封回信
用到的内容有1,尽量承公交车,骑自行车或步行
2使用电子贺卡
3打印时,尽量双面（double sided）打印
4节约用水用电,离开时关水龙头,电灯和电器
问题解答：
我来补答
One possible version:
Dear Chris,
I'm happy to receive your email asking about what we are doing to promote a low-carbon lifestyle.Now let me tell you something about it.
A campaign with the theme of "Actions Make a Difference" is going on in our school to call for a low-carbon life.For means of transportation,we now take buses,ride bicycles or walk if we can.Besides,we choose to use e-cards instead of traditional greeting cards.We only print things out when necessary,and print double-sided.And we try to save water and electricity in our daily life.For example,we are encouraged to have a shower instead of a bath,which uses far less energy and water.We always remember to switch off all appliances and lights when we're not using them.
What about you?Looking forward to your reply.[来源:高.考.资.源.网]
Yours,
Li Hua
