Students understand the text by reading for practice in last period. They also know the basic meaning of the new words according to the text. All of these prepare Students for grasping the use of the important words and expressions of this period.

　How to grasp the usage some important words and expressions .

Step I Leading in and warming up:

.1 Ask Students to work in groups and read the text again, and then finish Ex1 and Ex2 on P28 and .

(Teachers get Students to check the answers in groups after eight minutes.)

　 Step II Language points

　　1．The earth became so violent that it was not clear whether the shape would last or not.(P25)地球(开始)变得激烈动荡，不知道这个固体形状是否会继续存在下去。

　　完成句子

　　①她是一个如此好心的女孩，以至于她会帮助你。

　　She is____________that she can help you.

　　②这次考试很难，结果很多学生不及格。

　　This exam is____________many students failed.

　　③天气如此之好，我想去海滩。

　　It is____________that I would like to go to the beach.

　　Keys:　①so good a girl/such a good girl　②so difficult that　③such nice weather

They were in time to produce carbon，nitrogen，water vapour and other gases，which were to make the earth's atmosphere.(P25)最终它们产生了碳、 氮气、水

　　用time短语填空

　　①He can be really bad­tempered____________.

　　②William arrived at the theatre just____________for the play was to be on.

　　③Hurry up！The concert will begin____________.

　　④____________will I give up.

　　Keys: ①at times　②in time　③in no time　④At no time

用unlikely/likely/unlike/like填空

①They are so________that nobody believes they are sisters.