Astronomy:the science of the stars 编号002

【学习目标】1. Through series of activities , the students will be able to

1. speak out the Chinese 1meanings of the words & phrases and pronounce them correctly .

2. use the words & phrases correctly

【教学重点】Enable the students to grasp the usages of such important new words and expressions as voilent , unlike fundamental , dissolve ,multiply , exist , prevent, in time, lay eggs, give birth to, block out and so on .

【教学难点】How to enable the students to grasp the usages of key words and understand some difficult and long sentences.

【知识链接】名词性从句--宾语从句、表语从句; 非限定定语从句

【自主预习】

Words voilent , unlike fundamental , dissolve ,multiply , exist , prevent Expressions in time, lay eggs, give birth to, block out, cheer up Patterns 1. It exploded loudly with fire and rock, which were in time to produce the water vapor, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth's atmosphere.

2. Nobody knew that it was going to be different from other planets going round the sun.

3. It allowed the earth to dissolve harmful gases, which had become part of the earth's atmosphere, into the oceans and seas.

4. This encouraged the development of early shellfish and all sorts of fish.

5. They produced young generally by laying eggs.

【自学检测】Read the text carefully and fill in the blanks:

The earth was just a cloud of____after the "Big Bang".The earth______loudly with fire and rock.They were in_____to produce many things,which were to make the earth's atmosphere.As the earth cooled down,water began to appear on its surface.It allowed the earth to dissolve______gases.Then life began to develop.

The first small plants ______and filled the oceans and seas with oxygen.This encouraged the_______of early shellfish and fish.Land animals such as insects,reptiles and dinosaurs and son on appearedaftergreen plants appeared.Small clever animals__all over the earth.They are putting too___carbon dioxide intothe atmosphere,which___heat from the earth into space. Whether life will continue on the earth for millions of years to come will_____on whether this problem can be solved.

【预习疑问】

【课堂探究】

Task 1 Read the text aloud and then use own words to retell it .

Task 2 The following are some important words and phrases . Try to be clear about their meanings and read them correctly .

Permit ; account ; stare ; patience

voilent , unlike fundamental , dissolve ,multiply , exist , prevent

in time, lay eggs, give birth to, block out, cheer up

Task 3 Do exercises .