设计意图： 整体把握文章结构，思路清晰，便于理解文章内容。

Step 3 Scanning

　　Read the text quickly and find the answer to the questions:

　　1. Who wrote the magazine article? What is the name of the magazine?

　　2. What are the names of the three scientists mentioned in the article?

　　Dr Janice Foster, Charles Keeling, George Hambley.

　　3. What do they think about global warming? Do they agree with one another?

　　They don't agree with each other.

　　Dr. Janice Foster thinks the effects of global warming could be very serious.【来.源：全,品...中&高*考*网】

　　George Hambley thinks global warming will be mild with few bad environmental 【来.源：全,品...中&高*考*网】

　　consequences.【来.源：全,品...中&高*考*网】

increase in carbon dioxide.