效用可能性曲线(Utility of possibility curve)
参考答案:效用可能性曲线是一条表示在给定另一个人所得的效用时一个人能获得的最大效用。
根据2012年冀教版八年级英语上册Unit1《Me and My Class》Part One 回答下列问题。
1. What was Krista wearing?
_____________________
2. Did Gina always wear the best clothes?
3. Did Krista like Gina very much?
4. What did Krista want to do at last?
5. How many colours did Krista paint her runners?
大气中二氧化碳含量与日俱增的原因是[ ]
A、臭氧层被破坏,燃烧矿物燃料
B、大量森林被毁,太阳活动加强
C、大量森林被毁,太阳活动加强
D、燃烧矿物燃料,大量森林被毁