UNIT 16 Scientists at Work

Date:2006.4.
Class:Class 5,Senior Grade 1
Teacher: Lu kemao

Teaching aims:
I Get the students to understand the achievements of scientists in history and develop their enthusiasm for scientific experiments after reading the passage.
II Get the general idea of the passage.
Teaching procedures:
Step I Review the old lessons.
Step II Pre—reading Talk about some famous scientists in history and their great contributions to the world.
Step III Reading.
1.Read the passage and decide if the following statements are true or false.
1.In 1752 scientists already knew what electricity is. ( )
2.Fraklin was helped by a friend to do the experiment. ( )
3.Franklin made the kite of silk because wet silk does not conduct electricity. ( )
4.A condenser was used in the experiment to store electricity. ( )
5.The key tied to the string was put into the door to stop the kite from flying away.( )
2.Answer the following questions.
1 Why did Benjamin Franklin do this experiment with the kite ?
2.Why is it better to make the kite of silk than of paper ?
3.Do you think Franklin’s experiment was dangerous? Explain.
3.The pictures on page25 show how Franklin did his experiment. Pick out the correct ones.
4.Draw a sketch(草图) of the kite which was used in the experiment according to the instruction.
5.Play the tape and do the summary.
Benjamin Franklin was a world famous scientist. One day in June 1752,he wanted to show
that lighting and e_________ are the same, so he decided to do an e ________.In his experiment, he used a kite to a_______ lightning. On a rainy day, he took his son with him to a field. At first, nothing happened. Benjamin almost gave up when he saw the hairs on the s__________ stand up. He knew the string was getting c__________! He then felt some light but very clear e_____ s______ until in the end the whole string was wet. In this way he was able to collect and store a great d_____ of electricity into the c________ .His experiment p__________ that lightning and electricity are the same.
Step Iv Remember what we learnt today.
Step V Homework: 1.Read the text again and again
2.Wb.Ex--3
.
生词表: