17. If you feel   ( comfortable ) , sit down and have a rest.

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    Is there life on Mars? We still do not know.According to scientific data,we are s1 that people cannot live on Mars. People need much oxygen to breathe,but there is almost no oxygen on Mars.

   Living on Mars would be 1 2 living on a very high mountain.There would be little air. It might be 50℃ a 3 zero at noon and 100T!below zero at night.

   Many people u 4 to think there could be plants on Mars.We now know that Mars has very little carbon. Carbon is a kind of material found in all p 5 and animals on the Earth.

   Through a telescope,Mars 16 red.In some places,it seems grey.At times,the grey colour t 7 grey-green,then brown,and then grey again. People once thought this suggested that plant life changed c 8 with seasons.

   Today we know that the red colour c 9 from a fine dust of iron on the planet. Scientists are still working to e 10 the changing colours.Will man go to Mars one day? If they do,they will have to take along their own oxygen,food,clothes,and something to sleep in.

1. 2. 3. 4. 5.

6. 7. 8. 9. 10.

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10.隨著科技的發(fā)展，世界變得越來越小了。

 science and technology,the world is becoming smaller and smaller.

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13. (2015 江蘇徐州期末) This year's Beijing Musik Awards  next Saturday evening.

   A. has covered live

   B. will cover live

   C. will be covered live

   D. was covered live

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3. (2015 貴州齡西南中考) —I'm going to Lijiang on vacation next Sunday.-

   A. Have a good time

   B. Thank you

    C.You’re welcome  

   D. I have no idea

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5. What's the   (distant) from Tianjin to Beijing?

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5. I'd like to borrow a book on computer  (技術(shù)) .

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12. Look!The machine is   (spin) all the time.

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3. 工人們工作是為了滿足他們的需要嗎？

Do the workers work to  ?

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