1. Unit 4
Numbers
Revision

2. Rivision of the words
abacus
brain
calculator
lightning

3. Say and spell the words according to the meanings
1. _______: almost
2. _______: correct and true
3. _______: strong
4. _______: of or like people, not animals
5. _______: on the other side in a game, fight, etc.
6. _______: a group of things that work together
7. ______: grow bigger or stronger;become better
8. _______: give orders to a computer
nearly
accurate
powerful
human
against
system
develop
program

4. 9. ________: use numbers to find answers
calculate
A _________ is a __________ machine. It helps people to _________ faster and more accurately because it can do a difficult ___________ in a flash.
calculate(v.)计算
calculation(n.)计算
calculator(n.)计算器
calculating(adj.)计算的
calculator
calculating
calculate
calculation

5. 10. _______: make for the first time
invent
invent (v.)发明
inventor (n.)发明家
Benjamin Franklin was a famous ________ .He __________ the lightning rod（避雷针).It is a great ____________.
invention (n.)发明
inventor
invented
invention

6. 11. ________: that are going to be mentioned next
following
Can you answer the __________ questions?
_________ me please. I’ll show you the way.
following (adj.)下列的
follow (v.)跟随
following
Follow

7. 12. _______: not dead living living (adj.)活着的 live (v.)生活
Can all ___________ things __________ for several days without food?
13. ________ : very surprising
We felt __________ when we read the ________ story.
living
live
amazing
amazing (adj.)令人惊奇的
amazed (adj.)感到惊奇的
amazed
amazing

8. Revision of the phrases Say the phrases according to the meanings
1. ______________:long,long ago
2. ______________: not less than
3. ______________: in a very short time
4. ______________:not in the same way
5.__________________:in all one’s life
6. ______________: work out the problem
in ancient times
at least
in a flash
in different ways
in one’s whole lifetime
solve the problem

9. at least in a flash in ancient times
in different ways solve the problem
in one’s whole lifetime
1. We can use water _______________, such as washing clothes or cooking food.
2. Li Bai was a great poet who lived _____________.
3. It took us one hour to ______________
in different ways
in ancient times
solve the problem

10. at least in a flash in ancient times in different ways solve the problem in one’s whole lifetime
4. Your teacher looks old. He must be _________ 50 years old.
5. My father lived in China _______________.
6. The computer finished the calculation ____________.
at least
in his whole lifetime
in a flash

11. Keep the same meaning of each sentence
Revision of the sentence structures
Keep the same meaning of each sentence
1. I spent two days doing this job.
It ______ me two days _____ do this job.
2. He is strong. He can carry the heavy suitcase.
He is _____ strong ______ he can carry the heavy suitcase.
He is strong ______ ______ carry the heavy suitcase.
took to
that so
enough to

12. 3. The coat is expensive. He can’t buy it.
The coat is ______ expensive for him ______ buy.
The coat is not ______ ______ for him to buy. so
that
too to
cheap
enough

13. Read the text

14. Revision of the Passage Answer the questions about the text
What did people write in many different ways?
2. In what way did people count?
3. Who invented the zero?
4. Why was the zero a very important invention?
People wrote numbers in many different ways.
People counted in tens.
The Indians invented the zero.
Because it made it easier to write big numbers
and to calculate.

15. 5. Which was one of the first calculating machines?
6. Why do people still use abacuses today?
7. What can a modern electronic calculator do?
8. Why do we say computers are very powerful?
One of the first calculating machines was
an abacuse.
Because they are fast and accurate.
It can add, subtract, multiply and divide. It can
also calculate percentages and square roots.
Because it can do a calculation that you could
not do in your whole lifetime in a flash.

16. 9. How long did Shakuntala’s brain take to find the answer?
Shakuntala’s brain took fifty seconds to
find the answer.

17. Fill in the blanks according to the passage
Everyone knows the international ________ of numbers. In ancient times, numbers were written in ________ ways, but counting was nearly always in _____.
Everyone uses the number _______ 1 to 9 plus zero. The system was invented by the Indians. _______ makes it easier to write big numbers and to _________.
language
different
tens
system
Zero
calculate

18. There are three calculating machines, the abacus, the modern ________ calculator and the computer. Which is more powerful, the computer or the human ________? There was a competition between an amazing lady who is from ______ and a powerful computer. However, the lady won. Her brain ______ less time to find the answer, like _______. Computers can’t do anything by themselves. Someone had to first ________ the computer.
electronic
brain
India
took
lightning
program

19. What is each part mainly about?
P1: different ways of writing ancient numbers
P2: the system of numbers
P3: three calculating machines
P4: a powerful living computer

20. Group discussion calculate find play buy
In what way can computers help us in daily life?
calculate find play buy
talk study teach keep
type print draw solve
help….to… use…. to….
…….with… make it easier to…..

21. Homework 1. Read and try to recite the text
2. Write a passage of at least 60 words on the topic “My views on the computer”

22. Goodbye