摘要： Learn to carry out 3R Unit three: use in language Teaching steps: Step one: Learn-in Learning to learn Re=again, able=can be ====renewable A:Care collect done hope possible usual used wanted waste B:Positive: -able -ful re- Negative: im- -less un- * Form new words: Collectable, hopeful, impossible, useless, wasteful, hopeless, undone, unwanted, reusable. Unusual. Step two: Practice grammar and words: match the words with their meaning a. reusable b.Unhealthy c.unclean d.impossible e. untrue f. successful g.Uncomfortable

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Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
【小题1】We must use when we carry out this experiment.

B．some food

C．a table

D．some salt

【小题2】How long will it take to carry out this experiment?

A．More than three minutes.	B．Five minutes or two.
C．Only one minute or two.	D．About ten minutes.

【小题3】We can learn something about from the passage.

      What is the population of China? There are more than a billion and two hundred million people in China. It is
almost one fifth of the world's population. How to control the population growth is a big problem. Some people
think   1   to control the population growth. But I don't quite agree 2 them, because where there's a will, there
is a way.
      The question is that we should make it 3 how serious the population problem is. Our farmland is becoming
less and less to everyone. We have already got too many mouths to feed. 4 we control the population growth,
many people will die   5 hunger. Too fast population growth has been and will be bad for our nation. Though
laws (法律) have been 6 to control the population growth, in some places 7 is done to carry out (贯彻) the
law. We should make people 8 that it is foolish of them to bring too many children into the world. They should
9 do what they have been doing for many years.
      We are fighting against the fast population growth. Yes, the fighting won't end 10 everyone knows its
importance and does something for it.

(     ) 1. A. that is impossible for
(     ) 2. A. to
(     ) 3. A. known to everybody
(     ) 4. A. If not
(     ) 5. A. of
(     ) 6. A. pass
(     ) 7. A. many
(     ) 8. A. to know
(     ) 9. A. not longer
(     ) 10. A. until

B. impossible of
B. for
B. known by everybody
B. Unless
B. about
B. passed
B. little
B. to learn
B. not more
B. after

C. that is impossible of
C. with
C. know
C. Until
C. from
C. broken
C. a lot
C. know
C. no longer
C. when

D. it impossible
D. on
D. is know by
D. If
D. out of
D. thought
D. much
D. learning
D. no more
D. as

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完形填空。

      1 the population of China? There are more than 1.3 billion people in China. It is almost one fifth of the
world's population. How to control (控制) the population growth is a big problem. Some people think  2 to
control the population growth, But I don't quite agree  3 them, because  4 , there is a way.
     The question is that we should make it  5 how serious the population problem is. Our farmland is becoming
less and less to everyone. We have already got too many mouths to feel.  6   we control the population growth,
many people will die  7 hunger. Too fast population growth has been and will be bad for our nation. Though
laws (法律) have been  8 to control the population growth, in some places,  9 is done to carry out (贯彻) the
law. We should make people  10 that it is foolish  11 them to bring too many children into the world. They
shall   12 do  13 they have been doing for many years.
    We are fighting  14 too fast population growth. Yet, the fighting won't end  15 everyone knows its
meaning and does something for it.

(     )1. A. How many are
(     )2. A. that it impossible for
(     )3. A. to
(     )4. A. there's will
(     )5. A. known to everybody
(     )6. A. if not
(     )7. A. of
(     )8. A. past
(     )9. A. many
(     )10. A. to know
(     )11. A. about
(     )12. A. not longer
(     )13. A. that
(     )14. A. for
(     )15. A. until

B. What is
B. it impossible of
B. for
B. where there's a will
B. known by everybody
B. Unless
B. about
B. passed
B. little
B. to learn
B. for
B. not more
B. which
B. against
B. after

C. How much is
C. that it impossible of
C. with
C. there's the will
C. known
C. Until
C. on
C. broken
C. a lot
C. know
C. with
C. no longer
C. what
C. with
C. when

D. What are
D. it impossible
D. on
D. where there's the will
D. is known by
D. If
D. out of
D. thought
D. much
D. learning
D. of
D. no more
D. how
D. without
D. as

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完形填空。

    What is the population of China? There are more than 1.3 billion people in China. It is   1   one fifth of
the world's population. How to control the population growth is a big problem. Some people think it's   2
to control the population growth. But I don't quite agree   3   them because where there is a will, there is
a way.
    The question is how we could   4   it known to everyone how serious the population problems are. Our
farmland is becoming less and less to everyone. We have already got too many mouths to feed.   5   we
control the population growth, many people will die   6   hunger. Too fast population growth will be bad for
our nation. Though laws have been passed to control the population growth, in some places   7   is done to
carry out the laws. We should make people   8   that it is foolish of them to give birth to too many children.
They should no longer do what they have been doing for many years.
    We are fighting   9   too fast population growth. Yet the fighting won't end  10  everyone knows its
importance and does something for it.

(     )1. A. most
(    )2. A. possible
(   )3. A. to
(   )4. A. let
(   )5. A. If not
(   )6. A. of
(    )7. A. many
(   )8. A. to know
(    )9. A. for
(    )10. A. until

B. almost
B. necessary
B. for
B. make
B. Unless
B. about
B. little
B. to learn
B. against
B. after

C. highly
C. impossible
C. with
C. have
C. Until
C. in
C. a lot
C. know
C. to
C. when

D. hardly
D. unnecessary
D. on
D. bring
D. If
D. out of
D. much
D. learning
D. about
D. as

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Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again

1.
We must use when we carry out this experiment
1. A.
  a fridge
2. B.
  some food
3. C.
  a table
4. D.
  some salt
2.
How long will it take to carry out this experiment?
1. A.
  More than three minutes
2. B.
  Five minutes or two
3. C.
  Only one minute or two
4. D.
  About ten minutes
3.
We can learn something about from the passage
1. A.
  physics
2. B.
  biology
3. C.
  chemistry
4. D.
  maths

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We must use when we carry out this experiment

How long will it take to carry out this experiment?

We can learn something about from the passage

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