29. I      (visit) Hangzhou once. I      (visit) it a month ago.

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  Scientists are very interested in the universe,and they always want to know more about it. Years ago they knew many things about the  11     . They knew how big it was and  12       it was from the earth， 13      they still wanted to know more. They thought the best way was to 14      men to the moon. The moon is about 384,000 kilometres away from the earth. A common plane cannot 15      to the moon because the 16       reaches only  240 kilometres away from the earth.  But 17      can fly even when there is no air. That is a rocket(火箭) .

  How can a rocket fly? If you want to know,get a balloon (氣球) and then blow it up until it is quite big. Do not tie up(捆綁) the neck of the balloon,but let it go!The balloon will fly off 18      the air very quickly. The air inside the balloon can go through the air. It does not need wings like a plane.

There is gas(氣體) in the rocket，so it can fly out into  19         . Rockets with men in them have been to the moon. Several rockets without men in them have already flown to 20      planets much farther away than the moon. One day,rockets may be able to go to any place in space.

(   ) 11. A.  star   B. moon

   C.  sun   D. planet

(   ) 12. A.  how much   B. how long

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(   ) 13. A.  so   B. and

   C.  but   D. or

(   ) 14. A.  send   B. put

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(   ) 15. A.  walk   B. fly

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   C.  Jupiter   D. Mars

(   ) 17. A.  anything   B. nothing

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(   ) 18. A.  by   B. on

   C.  from   D. through

(   ) 19. A.  space   B. air

   C.  cloud   D. station

(   ) 20. A.  other   B. another

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(   ) 10. Eating fast food too much can be very harmful        your health.

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4. It’s     (possible) for me to be there before eight. It’s ten to eight now.

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(   ) 2. You can’t buy anything now. The shop has        closed.

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(   ) 4. —        ,  Li Ming?

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6. Eating vegetables is good for our      (健康) .

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3. It hasn’t rained          two months ago.

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