Saving the earth（The First Period）

4.help  the  students  to  know  something  about the pollution.
teaching important points：
1.improve the students’speaking ability.
2.improve the students’listening ability.
3.help the students to learn to support an opinion.
teaching difficult points：
1.how to improve the students’speaking and listening abilities.
teaching methods
1.listening-and-answering activity to help the students go through the listening material.
2.discussion to make the students practice supporting an opinion.
3.individual，pair or group work to make every student work in class.
teaching aids：
1.the multimedia
2.a tape recorder
3.the blackboard
teaching procedures：
step i greetings
greet the whole class as usual.
step ii warming up
  (show the pictures on the screen.)
 
t: look at these pictures. how beautiful they are!  do you want to pay a visit to
  these places?
ss：yes.
t：but in some places，it’s not so beautiful look at the pictures.please.
    (show  the following  pictures on the screen.)
   
t：what can you see in the pictures?
s：1 can see a river，which is polluted.the river water is very dirty.
s：i  can  see  smoke  coming  from  many  chimneys，and the air is dark.the air is polluted.
t：good.which problem do you think is the biggest one facing the earth?
s：i think it is the water pollution.
t：why do you think so?
s：because if water is polluted.people will not be able to get clean water to drink；
therefore，many people will get sick.it’s terrible.
t：very good.who has a different opinion?
s：i think the air pollution is the biggest problem.because if the air is polluted，    there will not be clean air for us to breathe.everybody will get terrible diseases.
t：quite right.now，who can tell us what causes these problems?
s：i think it is because people pay no attention to our environment.they pour
waste water into rivers，1akes and seas without cleaning it.
s：the air pollution is caused by the factories.people build factories to develop
the industry，but they never pay attention to  controlling  the  pollution.the
harmful smoke should be made harmless before it goes into the air，but few
   factories would like to do so  because this will cost much.
t：very good.now，who knows what we can do to solve these problems?
s：i think our government should pay more attention to environmental  protection.they should check the factories as often as possible to make sure    they don’t pour waste water into rivers or lakes and make sure they don’t let