Unit 18  Scientists at work2

unit 16  scientists at work
一、明確教學(xué)目標(biāo)
1. develop the students reading ability, especially their reading comprehension.
2. read the reading passage and know about
3. enable the students to know the serious attitude to science.
二、教學(xué)過程
step 1 presentation（整體感知）
do you know the names of some famous scientist? what are they famous for?
einstein darwin newton edison marie curie franklin
relative theory evolution gravity electric bulb radioactivity kite experiment
today we come to the reading. it s about as we all know ,benjamin franklin is a famous politician.but today, we will read a passage about him as a scientist. his serious attitude to science .let’s see how franklin made his famous electricity experiment by flying a kite.
step 2 pre-reading discussions
we all know that it is the scientists’ great effort that makes the great achievement on science. could you name some scientistsnames? and what are they famous for? try to fill in the blanks of the following form, if youcant, ask your classmate to help you.form: in the 18th & 19th centuries scientists all over the world made many important discoveries.give some example.physics medicine chemistry biology
some famous scientists are:
archimedes: mathematics and physics: he discovered pi (π)
darwin: biology: he discovered that the ancestors of people were monkeys
curie: physics: she discovered radium and radio¬activity
newton: physics: he discovered why all things fall down to earth.
physics medicine chemistry biology
√ madame curie √ florence nightingale √watson & crick √beatrix potter
(radioactivity) (pie charts) (dna) (\'seeds\' of mushrooms)
√ isaac newton √ john snow √gay-lussac √charles darwin
(gravity) (spread of disease) (gas laws) (evolution)
√ lord kelvin √ louis pasteur √ mendeleev √ carl linnaeus
(lowest temperature) (germs) (periodic table of elements) (naming plants)
step 3 reading fast reading
listen to the tape and answer the following question.
1. was the experiment done in june 1752 successful?
yes, the experiment was successful
2. what did this experiment prove?
this experiment proved that light- ing and electricity were the same.
read the text carefully again, and give the students some explanations.
get the students read the test and then decide if the following statements are 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.
3.franklin made the kite of silk because wet silk does not conduct electricity.