C

   There is nothing more important than the sail.Without the sun all living things(生物) on the earth will die.

    The sun is a star.In the sky there are thousands of stars like the sun.They are as large as the sun and as hot as the sun.At night you can see many stars,but in the daytime you can only see one star, the sun.

   The sun is much nearer to us than any other star.That is why it looks the biggest and brightest of all the stars.The distance(距离)of the sun from the earth is as much as 150 million kilometers.Most of the stills are thousands of light years(光年) a way from the earth.

    Do you know the light year? Nothing in the world travels laser the light.It travels at 300,000 kilometers a second(秒).And one light year is the distance that light travels in one year.

(  )81.Without the sun, ___________.

    A.some living things will live on the earth.

    B.people can’t live on the earth.

    C.some people can live on the sky.

    D.there will be no star in the sky.

(  )82.In the daytime you can only see the sun,because ___________.

    A.other stars can’t be seen.

    B.there are no stars in the sky.

    C.the sun is the biggest in the sky.

    D.The other stars only come out at night.

(  )83.Why does the sun look the biggest and brightest of all the stars?

A.The sun is far away from me earth.  

B.The sun is the nearest to the earth.

C.The earth is 150kilomeiers away from the sun.

D.The sun is much bigger and brighter than other stars.

(  )84.Light travels _____________.

   A.300,000kilometersam.mutes

   B.300,000metersa second.

   C.300,000metersaminute.   

D.300,000kilometersa second.

(  )85.“Light year”in the passage(文章)means ___________.

   A.light     B.distance      C.year      D.time

B

In 1620,about half the USA was covered by, forests.Today the forests have almost gone.A

lot of good land has gone with them,leaving only sand.China doesn’t want to copy the USA’s example.We’re planting more and more trees.We’ve built the Great Green Wall of trees across no.hem part of our country.The Great Green Wall is 7,000 kilometers long,and between 400 and 1,700 kilometers wide,It will stop the wind from blowing-the earth away.It will stop the sand from moving towards the rich farmland in the south.More Great Green Walls are needed.Trees must be grown all over the world.Great Green Walls will make the world better.

(  )76,In 1620,about _________ the USA was covered by forests.

     A.a third of     B.half     C.two third of     D.a fourth of

(  )77.A lot of good land has gone with ___________

     A.sand       B.water    C.wind        D.forests

(  )78.The Great Green Wall in China is ___________ long.

    A.7,000 kilometers         B.1,700 kilometers

     C.7.000 meters          D.400 kilometers

(  )79.Trees must be grown in ___________.

    A.China              B.the USA     

C.some countries          D.every part of the world

(  )80.__________ will make the world better.

     A.The Great Wall           B.Tall buildings   

C.Great Green Walls         D.Flowers and grass

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