人教版选修6 Unit4 Grammar 教案
Teaching material
NSEFC Book 6 -- Unit 4
Teaching aims
Enable the students to master the usage of the form it is/was... that.....
Teaching important points
How to enable the students to know the structure and the usage of the form it is/was... that....
Teaching difficult points
How to help the students to master the usage of the form it is/was... that....
Teaching aids
tape recorder, slides
Teaching procedures
Step1 Revision
T: First let's check answers. (slide show)
Discovering useful words and expressions. (P28)
1. Charles Keeling collected ______on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide _______ increasing during that time.
2. Although we are burning coal in huge _________ every year, we won't ________ of it for centuries.
3. If the amount of greenhouse gases continues to _______ we could be facing a global __________.
4. Many scientists believe that global warming has __________ through the burning of fossil fuels. They do not think that ignoring the issue is worth the ____.
5. ______ describes weather conditions over a period of years in a particular place.
6. The _____________ of a rising sea level would be widespread flooding.
7. The use of energy in Susanna's country is low ______________ the use of energy in the USA.
8. The warming of the earth is a _____________ that causes great concern.
9. The ________ shows temperature changes during the 20th century.
10. One hectare of forest can absorb 23 tons of carbon dioxide ____ year.
Keys:1.data kept on 2. quantities; run out 3. build up; catastrophe
9. graph 10. per
Answer keys for Ex.2 on Page 28:
The first graph shows the global _______________ between ________ and _________The temperature __________ and decreased over this period but on the whole it _________ by around _________ and its highest in 2000. There was a steady _________________ in the temperature during the twenty years after 1980. We can see from the graph that the earth has become ___________ since early last century.
The second graph shows the amount of ______________in the atmosphere from ________ to _______ .The carbon dioxide __________ steadily over this forty-year period. It went up from 315 to 370 parts ___________million.
Keys:
Temperature;1860;2000;increased;rose;1910;increase/rise;warmer