Unit 4 Global warming
Pa 1 Introduce a discussion over the questions of global warming.
1.compare
compare A with B：_______________compare A to B：_______________
compared to/ with: ________________
【寓词于景】
(1)教师的工作常被比作蜡烛。A teacher's work _________________ a candle.
(2)（如果你把她的工作和他的工作相比）________________________, you will find hers is much better.
(3)（和许多妇女相比）_____________________, she was indeed very fortunate.
2.come about:: take place; happen
【应用】Please tell me how the accident_____.I am still in the dark. (2005江西)
A. came by B. came out C. came to D. came about
【联想】How does/did it come about that…?
他怎么老是这么忙？______________________________________
Pa 2-3 Explain how global warming comes about.
3.There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global waming ……
(1)前2个that引导的是_________从句 (2)划线部分的句子是____________句
(3) There is no doubt that…________________
【注意】doubt 作动词，用在肯定句中时，后接whether或if引导的从句，用在否定或疑问句中，后接that 引导的从句
