Antarctica is colder than Arctic on average.

• A、 True
  
  

• B、False
  
  

• C、Not Given
  
  

Task 2

21. In the twentieth century, soot          

22. If snow and ice covered areas begin melting,           

23. A soot forcing is unusually effective, which          

24. Hansen cautioned that greenhouse gases          

25. Warming in the Northern Hemisphere was large in at middle and high latitudes.           

A. produces much more global warming than a carbon-dioxide forcing of the same magnitude

B. contributed to 25 percent of observed global warming

C. winter and spring

D. the warming effects increase

E. still surpass soot in warming the world's climate during the last century

F. can be seen mostly in the Northern Hemisphere

假如你是Jerry,你的好朋友John 考上了耶魯大學，請根據以下內容要點給他寫一封150 詞左右的英文祝賀信：

Main content:

1) congratulations;

2) the differences between college life and high school life;

3) your suggestions on a good college life.