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You can’t see any object unless light fr...

You can’t see any object unless light from that object gets into your eyes.Some of the things you see give off light of their own。The sun,the stars,a lighted lamp are the examples that can be seen by their own light.But most of the things you see are not giving off light of their own.They are just reflecting(反射)light that falls on them from the sun or some other luminous bodies.The moon,for example,doesn’t give off any light of its own.It is not 1uminous.You see it because sunlight falls on it and some of the sunlight reflects on the earth.So moonlight is only second—hand sunlight.

    When you look at a book,it sends some of the light which fails on it to your eyes,and you see the book.If light could be kept out from where you’re so that there would be no light from the book to reflect.Then you couldn’t see the book even with your eyes wide open.Light travels so fast that the time in which it travels from the book you’re reading to your eyes is as short as if there were no time at time.Light reaches us from the moon,which is about 380,000 kilometres away,in only a little more than a second.

1.You can see the book because________.

     A.your eyes are close to it       B.it reflects some of the light

     C.it has light of its own         D.it is big enough to be seen

2.The Chinese meaning of the world“luminous”is close to_______.

     A.闪光的       B.看不见的      C.发光的       D.明亮的

3.________has light of its own.

A.The moon   B.The earth   C.The sun    D.The satellite of Dong Fong Hong

4.Light travels about_________kilometers per second.

    A.300,000      B.100,000      C.400,000        D.190,000

5.Which of the following is TRUE?

    A.All the things you can see give off light.

    B.Light from the book is much faster than that from the moon.

    C.The moment you open your eyes,the light from the book travels to your eyes.

    D.Light travels so fast that there is no time for you to read.

 

1.B 2.C 3.C 4.A 5.C 【解析】略
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Mary didn’t understand such sentences as“She is blue today”,“You are yellow”,“He has a green thumb”,“He has told a white lie”and so on.And she went to the teacher Mrs James for help.

Mary:Mrs James,there is a colour in each of the sentences.What do they mean?

Mrs James:In everyday English,Mary,blue sometimes means sad,yellow afraid.A person with a green thumb grows plants well and a white lie is not a bad one.

Mary:I'm afraid I don’t understand them a11.Would you give me an example for“a white lie”?

Mrs James:Certainly.Now I just give you some cakes.In fact you don’t like it,but you don’t want to let me know it.Instead you say,“No,thanks.I’m not hungry.”That’s a white lie.

Mary:It sounds very interesting.Thanks very much.

Mrs James:You are welcome.Colours are meaningful.I think you will meet more sentences like these in the future.Please come to me if you have any questions.

1.Blue sometimes means sad in________English.

      A.good         B.spoken       C.usual         D.poor

2.I don’t have a green thumb,so all my plants________.

     A.die off       B.grow well    C.look nice      D.are good

3.David is yellow and he is________to climb the tall tree!

     A.happy        B.clever       C.brave         D.afraid

4.He didn’t like me to know________of the accident.He told me a white lie at last.

     A.the reason     B.the true story    C.the meaning    D.the answer

5.He is ________today.He is told that his father is seriously ill.

     A.blue         B.yellow         C.green          D.white

 

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Which of your two hands do you use most? Very few of us can use __1__  of our hands equally well. Most of us are right-handed. Only about five people ___2___ a hundred are left-handed. New-born babies can grasp(抓住)objects with__3____ of their hands, but in about two years they usually prefer to use their ___4___ hands. Scientists don’t know why this __5___.

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A.would;to drink    B.would;like    C.would;liking     D.would;drink

 

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       A.are there        B.there are      C.is there      D.there is

 

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