Making a difference（The Fourth Period）

     (bb: a good scientist must be curious and careful. great scientists use their creativity and imagination to come up with new ideas.
…
   she used a model to solve the problem.)
   one possible version: my favourite scientist is darwin, who was born in 1809 at shrewsbury.   darwin was a famous british naturalist. his great contribution to science was the theory of evolution. he developed his theory after years of observation and through numerous scientific experiments. in his theory, he declared that different types of living creatures on the earth had not been created suddenly but had been developing over thousands of millions of years. he believed that the survival of the fittest was the law in the struggle of life on earth. his ideas were not imaginative. he had gone on a long journey to different parts of the world and studied the animal    and plant life he found.
 darwin lived on until 1882. he wrote many books throughout his life. but the origin of species was one of the most famous pieces of writing.
step ⅵ summary and homework
t: in this class, we've reviewed the useful expressions and the important gram mar—the' infinitive in this unit. and we've also learnt a passage about some scientist we've practised how to write a descriptive paragraph. after class go over all the important points learnt in this unit and finish your writing. class is over.
step ⅶ the design of the writing on the blackboard
unit 1 making a difference
the fourth period
a good scientist must be curious and careful
great scientists use their creativity and imagination to come up with new ideas. scientists must also be intelligent and patient.
the experiment proved that her was theory correct.
other scientists were surprised by her discovery and called it a success.
she used a model to solve the problem.
step ⅷ record after teaching