Scientists at work教案1

教學(xué)示例（二）
　　i. teaching aims:
　　talk about science and scientists.
　　learn how to give instructions.
　　similar dialogue presentation with new words and expressions used within
　　ii. teaching aids: tape recorder, pictures, slides
　　step 1 pre-reading
　　1.t ask ss: do you know the names of some famous scientists?
　　what are they famous for?
　　t show some pictures and ask : do you know the scientists? what are they famous for?
　　      　　       　   
　　albert einstein 愛(ài)因斯坦 galileo galilei伽利略 marie curie居里夫人
　　   　       　 
　　stephen hawking     charles darwin達(dá)爾文    yuan longping袁隆平
　　史蒂芬•威廉姆•霍金
　　2. group work
　　let ss work in pairs , and name some scientists who made many important discoveries in the eighteenth and nineteenth centuries .(slide show)
　　step ii. reading
　　1. skimming   let ss read the passage carefully and answer the question:
　　why did benjamin franklin do this experiment with the kite?
　　 (he wanted to show /prove that lightning and electricity are the same thing.)
　　2. skipping  let ss read the passage again, and finish the following exercises: (slide show)
true (t)or false (f)
1. in 1752 scientists already knew what electricity is. (t )
2. franklin was helped by a friend to do the experiment. (f  )
3. franklin made the kite of silk because wet silk does not conduct electricity. (f  )
4. a condenser was used in the experiment to store electricity. (  t )
5.the key tied to the string was put into the door to stop the kite form flying away. (f  )
　　3. extractive reading   let ss read the passage carefully, and answer the following the questions:
　　a.why is it better to make the kite of silk than of paper?
　　(a slik kite will last longer in bad weather than a paper kite. )
　　b. do you think franklin’s experiment was dangerous? explain.
　　(yes franklin’s experiment was very dangerous because if something went wrong he could be killed by the lightning. )
　　 4. let ss find out the keys of the exercises after their reading.(slide show)
aim: to show that lightning and electricity are the same.
materials: some wooden sticks, a piece of silk, some rope, a very sharp piece of metal, a silk ribbon, a key, a condenser, a small shed, a thunderstorm with lightning.
results: the electricity stored in the condenser can be used to do other experiments, which proves that lightning and electricity are the same.