2015-2016学年人教版选修6unit 4learning about language
2015-2016学年人教版选修6unit 4learning about language第5页

2. Although we are burning coal in huge _________ every year, we won’t ________ of it for centuries. 3. If the amount of greenhouse gases continues to _______, we could be facing a global __________.

quantities

run out

build up

catastrophe