题目内容

阅读下文并回答问题。

I’m Sally . I was a shy girl . Bu this term , I decided to do a brave(勇敢)thing . In this term , we had a new subject to learn –physics . When our teacher asked someone to be the physics monitor(物理课代表), I put up my hand and got the role . But it was not as easy as I thought .

At the beginning , I found that many students did not hand in(上交)their homework , so I was a little worried . I shouted at the students . It made the students angry . One girl asked : “ Why are you shouting at me ? You’re making it seem like it is all my mistake(错误). ” Then I found that , it was my mistake in fact . I should talk to my classmates in a kind way and not get so angry .

After this , I changed(改变)how I spoke . “ Excuse me . Could you please finish your homework ? ” I said . Later , I was surprised that many students understood me a lot better and finished their homework quickly.

I found the best way to do this job is to talk with my classmates in a friendly way . Now , I am getting better and better with my classmates . This job makes me feel like I am growing up like a little tree day by day .

1.When did Sally have the new subject physics ?

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2.Is it easy for Sally to be the physics monitor at the beginning ?

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3.Why did Sally feel a little worried at first ?

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4.What is the best way for Sally to do the job ?

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3.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:3clean 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.(238words)
35.In the first part of the experiment the cotton wool is most probably used toA.
A.keep the air dry                            B.keep the tube wet
C.make the nails rust                          D.keep the tube clean
36.What are necessary steps to make sure the water in the tube is air free?D
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
37.We can conclude from the experiment that onlyC makes iron rusty.
A.dry air        B.cotton wool      C.ordinary water     D.air-free water.

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