From a plane you can see the fields, cities, mountains or rivers   46    . If we go into space, we see more and more of the earth. Many man-made satellites   47    into space to look at the earth, the stars and other planets and   48    more about them.

The moon is our nearest neighbor in space. It is our satellite and men   49    it already. It is   50    than the earth. Plants can’t grow on the moon because there is no air   51    water on it.

The moon hasn’t its own light. It shines back the light of the sun. When the sun is shining on the side of the moon that   52    us, it looks like a great round ball. We can’t see the moon when the sun is shining on the side of the moon that faces away from us.

In fact ,the moon isn’t as   53    as it looks. It is three hundred and eighty thousand kilometers away from the earth. Of course we can fly to the moon from the earth   54    a spaceship. A spaceship flies very, very fast, and it flies at about eleven kilometers a second. So it only takes more than three days to   55    there by spaceship.

(   ) 46. A. below    B. over      C. above

(   ) 47. A. send     B. sent      C. are sent

(   ) 48. A. learn    B. learned     C. to learn

(   ) 49. A. visit     B. will visit    C. have visited

(   ) 50. A. bigger    B. smaller     C. the smallest

(   ) 51. A. or      B. and      C. with

(   ) 52. A. face     B. faces      C. to face

(   ) 53. A. near     B. nearer      C. the nearest

(   ) 54. A. by     B. take       C. in

(   ) 55. A. arrive in   B. get to      C. reach

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