题目内容

Wool is used ________ clothes．


  1. A.
    for making
  2. B.
    for make
  3. C.
    as
  4. D.
    to making
A
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A Simple Scientific Experiment

Below is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air and with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes. (This makes sure there is no air in the water.
(3)Put two or three clean nails in the water.
(4)Add some oil to the water. (This will keep air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half –fill a test tube with water and add two or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water. (238 words)
【小题1】In the first part of the experiment the cotton wool is most probably used to ______________.
A．keep the air dryB．keep the tube wet
C．make the nails rustD．keep the tube clean
【小题2】What are necessary steps to make sure the water in the tube is air free?
①Leave half a tube of water in it              
②Boil the water for some time
③Put some clean iron nails in the tube           
④Add some oil to the water
A．①②B．①③C．②③D．②④
【小题3】We can conclude from the experiment that only ____________ makes iron rusty.
A．dry airB．cotton woolC．ordinary waterD．air-free water

A Simple Scientific Experiment

Below is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air and with water.

Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.

Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.

Iron in dry air

Method

(1) Put some iron nails at the bottom of a test tube.

(2) Push some cotton wool down the tube.

(3) Leave the tube for one week.

Result

After one week, the nails have not rusted.

Conclusion

Iron does not rust in dry air.

Iron in air-free water

Method

(1) Half-fill a test tube with water.

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

(3) Put two or three clean nails in the water.

(4)Add some oil to the water. (This will keep air out of the water.)

(5) Leave the tube for one week.

Result

The nails do not rust in the tube with air-free water.

Conclusion

Iron does not rust in air- free water.

Iron in ordinary water

Method

(1) Half –fill a test tube with water and add two or three clean nails.

(2) Leave the tube for one week.

Result

The nails rust in the tube with ordinary water.

Conclusion

Iron rusts in ordinary water. (238 words)

1.In the first part of the experiment the cotton wool is most probably used to ______________.

   A. keep the air dry                            B. keep the tube wet

   C. make the nails rust                          D. keep the tube clean

2.What are necessary steps to make sure the water in the tube is air free?

①Leave half a tube of water in it              

②Boil the water for some time

③Put some clean iron nails in the tube           

④Add some oil to the water

  A. ①②                  B. ①③                 C. ②③                D. ②④

3.We can conclude from the experiment that only ____________ makes iron rusty.

A. dry air       B. cotton wool           C. ordinary water         D. air-free water

 

(B) 根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。

1.I have ordered several ________(册) of this book from abroad. Would you like to have one?

2.The silk shirt feels much ___________ (光滑的) than the wool one.

3.We are not sure if the man has any criminal ______________ (记录).

4.Jim is so _______________ (幽默的) that he is always making us laugh.

 

A Simple Scientific Experiment
Below is a description of a single scientific experiment. It shows us how iron reacts ( 反应) with air and with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes. (This makes sure there is no air in the water.
(3)Put two or three clean nails in the water.
(4)Add some oil to the water. (This will keep air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half –fill a test tube with water and add two or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water. (238 words)

  1. 1.

    In the first part of the experiment the cotton wool is most probably used to ______________.

    1. A.
      keep the air dry
    2. B.
      keep the tube wet
    3. C.
      make the nails rust
    4. D.
      keep the tube clean
  2. 2.

    What are necessary steps to make sure the water in the tube is air free?
    ①Leave half a tube of water in it              
    ②Boil the water for some time
    ③Put some clean iron nails in the tube           
    ④Add some oil to the water

    1. A.
      ①②
    2. B.
      ①③
    3. C.
      ②③
    4. D.
      ②④
  3. 3.

    We can conclude from the experiment that only ____________ makes iron rusty.

    1. A.
      dry air
    2. B.
      cotton wool
    3. C.
      ordinary water
    4. D.
      air-free water
阅读理解。
A Simple Scientific Experiment
Below is a description of a single scientific experiment  . It shows us how iron reacts ( 反应) with air and
with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c)
in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes.( This makes sure
there is no air in the water.
Put two or three clean nails in the water.		 (4)Add some oil to the water. ( This will keep
air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free
water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half -fill a test tube with water and add two
or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water.          
1.  In the first part of the experiment the cotton wool is most probably used to ______________.        
A. dry air                  
B. cotton wool          
C. ordinary water        
D. air-free water
2. What are necessary steps to make sure the water in the tube is air free?
①Leave half a tube of water in it                ②Boil the water for some time
③Put some clean iron nails in the tube        ④Add some oil to the water
  A. ①②                  B. ①③                 C. ②③                D. ②④
3. We can conclude from the experiment that only ____________ makes iron rusty.
A. keep the air dry                            
B. keep the tube wet
C. make the nails rust                          
D. keep the tube clean

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