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The active ______ a part which _____teachers ______ the school rules better.


  1. A.
    take, have made, understand
  2. B.
    play, has made, understood
  3. C.
    take, has made, understanding
  4. D.
    play, have made, understood
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请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入最恰当的单词。
注意:每空格1个单词。
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Title
 More Models of Hydrogen Cars Being Tested
The progress of hydrogen fuel cell
·【小题1】________ by Sir William Grove in 1839.
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·Used in Apollo spaceships in the twentieth century.
 Operating principle of P.E.M.
·It has two sides divided by a thin membrane.
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·The electrons are 【小题4】________ from the protons in the hydrogen atoms.
·The protons pass through the fuel cell to the other side.
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请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入最恰当的单词。

注意:每空格1个单词。

For years, the automobile industry has been testing vehicles that use hydrogen as fuel. Now, people across the United States have had a chance to see and even drive cars that get power from hydrogen fuel cells (燃料电池).

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 More Models of Hydrogen Cars Being Tested

The progress of hydrogen fuel cell

·1.________ by Sir William Grove in 1839.

·Designed 2.________ ever since.

·Used in Apollo spaceships in the twentieth century.

 Operating principle of P.E.M.

·It has two sides divided by a thin membrane.

·Hydrogen gas from one side 3.________ the active metal platinum.

·The electrons are 4.________ from the protons in the hydrogen atoms.

·The protons pass through the fuel cell to the other side.

·Oxygen from the air is5.________ into the other side of the fuel cell.

·The gas meets the protons,and then water and heat are6. ________

Reasons for slow 7.___________

of hydrogen fuel cell cars

·There are many technical problems8. ________

·The durability of the membranes in P.E.M. fuel cells is not clear.

·They have to start easily at 9.________ temperatures and in dry climates.

·They must be smaller and less costly before 10.________ gasoline engines.

 

 

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