Making a difference（The First Period）

ss: yes.
t: you can use the expressions at the bottom of this page when you debate each other. they are very helpful.
  (five minutes later, teacher checks their debate.)
t: which group would like to give a performance? please come to the blackboard.
   (one of the groups come to the blackboard and begin their debate.)
s: i think that biology is the most important and useful science because it is essential to protecting the ecological balance and environment. people can’t live without living things. furthermore, biology goes hand in hand with our life. if there were no science of biology, there would not be medicine. in a word, biology is the most important and useful.
s: well, maybe, but i think that chemistry is the most important and useful, because chemistry is the key to the progress of the human being. besides, it is chemical reaction that produces many new things.
s: it is hard to say. there are many physical products. and physics is widely used in many fields, such as medicine, industry and agriculture. there would be no life without physics. so i think   physics is the most important and useful science.
s: that's true. but maths is the basic science. you can't learn physics or chemistry well without a good knowledge of maths. maths is a tool in science and engineering. therefore, maths is the most important and useful science. what's your idea?
s: well, there is no doubt that maths is an important and useful science. in my opinion, the most important and useful science should be computer science in our modern information society. the       computer is now an indispensable tool in many fields. it can settle all kinds of problems at a high speed and can help people work easily. so i think computer science is the most important and useful science.
step v summary and homework
t: today we've done some listening and speaking. we have also talked about science and scientists. after class, please search more information about science and scientists on the internet       or in the library. and don't forget to preview the reading material “no boundaries”. so much for today. class is over.
step ⅵ the design of the writing on the blackboard

unit1 making a difference
the first period
scientists       contributions
maria curie     radium/polonium
zhang heng     seismograph
      charles darwin   the theory of evolution