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B Below is a table which shows the melti...

 

B

Below is a table which shows the melting(液化)and boiling points of common substances.Study the table.Then do Numbers 4—7.

Substance

Melting point(C)

Boiling Point(C)

Water

Alcohol

Nitrogen

Oxygen

0

–117

–210

-218

100

78

–196

–183

4.The underlined word‘substances'means‘a type of'_________.

A.matter        B.liquid            C.solid         D.gas

5.Which of the four should be a liquid at-90 degrees?

A.water         B.alcohol           C.nitrogen      D.oxygen

6.Mixing alcohol and water is often used to wash windscreens of cars during the wintertime because _________.

A.it is easier for alcohol to change into gas

B.alcohol is not easily separated from water

C.alcohol freezes at lower temperature than water

D.the mixture is not expensive

7.In order to change water from a solid to a liquid energy must be _________.

A.removed       B.added             C.created       D.destroyed

 

 A  B  C  B 【解析】
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六、Reading comprehension.(阅读理解)20分

A

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In the last century there were not  1  big towns in the U.S. 2  there are today.Most towns in the country were small.And in these small towns,the general store was  3  people  4   the things they couldn't made or grow at home.

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