必修三第四单元课文二教学案

制作人：

曹倩

审核人

郭光宝

使用时间

2015-3-25 

年级签字

编号

16

——课前预习案——

一、翻译文章中的几个句子。

1.Last month I was lucky enough to have a chance to make a tripe into space with my friend Li Yanping,an astronomer.

____________________________________________________

_____________________________________________________

2.Before we left,Li yanping explained to me that the force of gravity would change three times on our journey and that the first change would be the most powerful.

_____________________________________________________

_____________________________________________________

3.When we get closer to the moon,we shall feel its gravity pulling us,but it will not be as strong a pull as the earth’s.

____________________________________________________

_____________________________________________________

4.We are too far from the earth now to feel its pull.

____________________________________________________

——课中探究案——

一、检查反馈，导入新课。

____________________________________________________

____________________________________________________

二、目标定位，确定重点。

⒈记住文中的重点短语。

2.熟记文中的重要语言点并灵活运用。

三、自主探究，教师点拨。

1．有机会做…               2．作一次太空旅行         

3．向某人解释               4．如此…以至于…        

5．彼此，互相               6．落到地上              

7．太…以至不能…           8．远离                 

9．更靠近，接近             10.感到高兴             

11．向前迈步               12．摔倒              

13．既然，由于              14．过了一会儿          

15．熟悉，掌握              16．玩的愉快               

17．返回到…                18．了解更多…             

四、尝试演练，合作解疑。

1．...，I found I was carried twice as far as on the earth and fell over.……

译：                                                      。

句式提取：...twice as far as...

倍数的表达方式：

(1)“A＋倍数＋形容词或副词的比较级＋than＋B”

(2)“A＋倍数＋as＋形容词或副词的原级＋as＋B”

(3)“A＋倍数＋the size/height/length/width，etc.＋of＋B”

练习： (1)There are                                than in yours.

我们图书馆里的书比你们图书馆里的书多五倍。

(2)They have                       cows   we have.

他们的牛是我们的三倍。

(3)My house is twice the size of my parents’．

我的房子是我父母的两倍大。

2．“Oh，dear，” I cried，“walking does need a bit of practice now that gravity has changed.”

译：                                           

句式提取：now that引导原因状语从句，now that同since相似，语气较弱，强调人们已知的事实。

练习：

1. 既然你忙, 就让我给你做吧。

2. 既然人都齐了, 咱们开始干吧。

五、当堂检测，拓展延伸。

1．Our city has experienced________ this year as it did last year.                         

A．twice as much rain  B．rain twice as much

C．as twice much rain  D．twice rain as much

2．We must ________ the act of cheating ________ a fair competition system.

A．prevent; creating                              B．stop; to create

C．keep; from creating                D．stop; creating

3．________ Mr.Smith is well again，he can go on with his work.

A．Now and then B．Now that  C．The other day  D．Now just

4．We're trying to create a(n)________ of trust between management and staff.

A．scene                B．view  C．atmosphere                              D．sight

5．It's just ________ among countries to host the Olympics as to win an Olympic medal.

A．much as a competition   B．as a much competition

C．as much a competition   D．a competition as much

六、课堂小结，布置作业。

做同步练习册。

——课后巩固案——

I.翻译句子

1．既然大家都到了，咱们上课吧。

2．既来之，则安之。

3.我的房子是我父母的两倍大。

II.选词填空

1．Nothing can         their plans      being carried out.

2．The doctor came         to save her life.

3．The police’s responsibility is to            the safety of the community.

4．Don’t recite all together；one           .