Scientists at work教案1
4. listening play the tape and let ss follow, paying attention to the intonation.
step iii discussion
t says: in order to conduct science experiments, scientists must often find practical solutions to overcome problems, make large scale natural phenomena manageable and think about their own safety.
let ss work in group and discuss how franklin used his creativity to overcome various problems for his experiment
1. we cannot go and look for lightning ,so franklin has to find a way to make lightning come to him: he attracted lightning using a kite.
2. a kite made of paper won’t last long in rainy weather, so he had to make a strong kite: he made his kite of silk.
3. a silk kite doesn’t attract lightning, so he had to add something: he fixed a long, sharp piece of metal to the top of the longest stick of the cross.
4. he had to collect and store the electricity, so that he could later use it in other experiments: he brought a condenser.
5. he had to make sure that he himself would not be hit by the lightning, so he had to find a low place where he could keep himself and his tools dry: he used a small shed in the fields
6. he had to stop the kite from flying away, without touching the string that would be charged with electricity: he tied a silk ribbon to the string that he kept dry by standing inside the shed. dry silk doesn’t conduct electricity, so it was safe to hold it in his hands.
7. he had to direct the electricity towards the condenser, with piece of metal at the end of the string: he tied a metal key to the end of the string.
step iv post-reading
translate the following sentences into english.(slide show)
1、弗蘭克林的風箏實驗表明，閃電和電是一碼事。（experiment）.
2、有些人認為，和能源對環境構成的威脅遠遠超出它給社會帶來的益處。（nuclear energy）
3、輕微的電擊對人體無礙，但強電卻能致人死命。（electric shock）
4、關于這位科學家的家庭生活，眾說紛紜。（a great deal of）
5、你怎么證明你沒干這件事？（prove）
6、作為人類最早的發明之一，輪子至今仍在人類活動中發揮著重要作用。（wheel）
7、琳達很生氣，把信撕成碎片，扔進了垃圾筐。（tear）
8、根據英國法律，每一種新藥必須在至少兩種不同類的動物身上試驗。（test on）
1. franklin’s kite experiment showed that lightning and electricity are the same.
2. some people think that the threat that nuclear energy forms to the environment weighs much
more than the good it does for society.
3. a light electric shock does no harm to the human body, but a strong one can kill.