教学内容分析
The emphasis of this period will be placed on the important new words，phrases and sentence pa
tterns in Warming Up，Pre－reading，Reading，Comprehending and Discovering useful words and expressions in Learning about Language.There are altogether 53 new words and phrases in these five pa rts.20 of them are marked with triangles，which shows that the students needn't learn them by heart.It is enough to recognize them when meeting them while reading the passage.The other 33 should all be remembered，among which the following words and expressions are even more important：tend，range，subscribe to，go up，widespread，state，glance，steady，tendency，keep on，on the whole，quantity of，be opposed to，come about，result in，even if.They are all very useful and important.So are the sentence patterns “...it is a rapid increase when compared to other natural changes.” and “There is no doubt that the earth is becoming warmer...” We ought to pay more attention to them.
三维目标设计
Knowledge and skills
1．To get the students to learn to use the following important new words and phrases freely：tend，range，subscribe to，go up，widespread，state，glance，steady，tendency，keep on，on the whole，quantity of，oppose，come about，result in，even if.
2．To get the students to understand and use the following important and useful sentence patterns：
(1)．..it is a rapid increase when compared to other natural changes.
(2)There is no doubt that the earth is becoming warmer...
