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Below is a description of a simple scientific experiment.It shows us how iron reacts with air and with water.

Aim:To find out if iron rusts in water that has no air in it(air-free water).

Apparatus:3 clean iron nails; test tubes; test tube holder; cotton wool; oil; Bunsen burner

1)Iron in air-free water

Method

1.________ a test tube with water.

2.________ the water for three minutes.(This makes sure there is no air in the water.)

3.________ two or three clean nails in the water.

4.________ some oil to the water.This will keep air out of the water.

5.________ the tube for one week.

Result 6.________

Conclusion 7.________

2)Iron in ordinary water

1.________ a test tube with water and add two or three clean nails.

2.________ the tube for one week.

Result 3.________

Conclusion 4.________

答案:
解析:

  1)1.Half-fill 2.Boil 3.Put 4.Add 5.Leave 6.The nails do not rust in the tube with air-free water.

  7.Iron doesn’t rust in air-free water.

  2)1.Half-fill 2.Leave 3.The nails rust in the tube with ordinary water. 4.Iron rusts in ordinary water.


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Educating girls quite possibly yields a higher rate of return than any other investment (投资)available in the developing world. Women's education may be unusual territory for economists(经济学家), but enhancing women's contribution to development is actually as much an economic as a social issue. And economics(经济因素), with its emphasis on incentives, provides guideposts that point to an explanation for why so many girls are deprived(剥夺)of an education.
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Educating girls in more【小题2】    than any other investment.
Families
From low-income families
From educated mothers’ families
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Girls are of less【小题3】         
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Development should be for all【小题4】
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【小题5】          
There is【小题6】    invests ment in daughters.
Girls are made to may at home, 【小题7】
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