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Lecture3： Evolution
本文主要研究鸟类翅膀进化的话题。侧重在飞行这种能力的角度。提出两种理论：
1.从地往上——动物要快速蹦跑，两只后腿边发达，前肢变成翅膀;
2.从树往下——恐龙之类的动物住在树上，需要跳来跳去滑来滑去，形成翅膀帮助平衡。问题是，他们没指出整个翅膀形成过程的每一步对动物都有什么作用。后面提出，羽毛也有作用，对动物养育幼儿的方式的影响。
Speaking：
Task1
1.Your friend will move to a school and worried about making new friends there. What kind of advicewill you give him to help him make new friend in the new school? Why?
2.The student is asked to write final project about the famous Historical city which you're located in. Which we do you choose?
1.video the famous building
2.visit the old people
3. Research and write paper
3.Why do you think the biggest challenge is that people are not able to save money?
How to solve the problem?
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