中学试卷

out the fire.

There was a lot of damage. 90,000 people were left homeless, and 18,000 buildings were destroyed. Property damage (财产损失）was almost 200 million dollars. In addition, about 300 people died.

People from all over the world helped Chicago by sending food and clothing. Within a month 4,000 cottages (小屋）with two rooms had been built to house people. In a few years, Chicago was completely rebuilt.

( )29.The best title for this passage is_______.

A.Mrs. O’Leary's Cow

B.A Terrible Fire

C.An Oil Lamp

D.The Year 1871

( )30.Which parts of the city were hurt by the fire?

A.The West Side.

B.The South Side and the East Side.

C.The North Side.

D.All sides.

( )31.People who stayed in Chicago after the fire showed .

A.courage

B.fear

C.weakness

ziness

( )32.What helped to spread and to end the fire?

A.A cow.

B.Firemen

C.The weather.

D.Carelessness

C

Two boys, both of the same weight, sit on each side of a see-saw (跷跷板）. How far must they be from the centre in order to keep the see-saw balanced(平衡的) ?

By moving to different positions, they will soon find out that they have to sit at equal distances from the centre. Now, if one of them is heavier, the heavier boy has to be nearer to the centre to make the see-saw balanced.

Things to do:

Take a stone in each hand. Can you find out which stone is heavier? If the two stones are about the same size, you may not be able to tell which one is heavier. Place a pencil on two piles of books and balance a ruler and move them until the ruler is balanced. Find out how far each stone is from the pencil. The stone nearer to the pencil is the heavier one. Now you know a simple weighing machine （秤）works.

( )33. The writer wants to tell us_______.

A. what see-saw is like

B. how to keep a see-saw balanced

C. how a simple weighing machine works

D, what a simple weighing machine is like

( )34. If two boys sit at equal distances on each side of a see-saw, the boy in the higher place shows_______.

A. he is taller

B. he is shorter

C. he is heavier

D. he is lighter

( )35. A see-saw is used_______.

A. to weigh which boy is heavier of the two

B. to find out the weight of a boy

C. to make a simple experiment

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