Unit 4 Global warming
全员探究
Warming Up
1. An energy source is “renewable” when supplies of it never run out.
[要点导航] run out作不及物动词，表示“被用完了（become used up)”的被动含义，其主语通常是时间、金钱、食物等无生命名词。例如：
___________________________________________他的钱很快就花完了。
Our supplies finally ran out.我们的供给终于耗尽了。
[思维拓展] run out of=use up vt. We have used up our money.
[要点导航]renewable adj 能再生的；可再生的renew v 更新，恢复，重新开始
1) re-是一 个动词前缀，表示“新”“再” eg:
recycle 回收 rewrite 改写
reform 改革 refine 精练
retell 复述 recover 恢复
2) able-是一个 形容词后缀表示“可…的”“能…的”
acceptable 可接受的，可理解的 respectable 值得尊敬的
Reading
1.That probably doesn’t sound very much to you or me but it is a rapid increase compared to most natural changes.
[要点导航] compare v. 比较,对照,比喻,比作
