VI.完形填空;10'

    Men have been interested in the stars __46__  they first looked up __47__ the sky. Some of these stars may have __48__ planets(行星). If that is so . we can know __49__  life may exist (生存) on one of __50__ . The problem is that the nearest __51__ is four light years away. In other words, light from it has been travelled for __52__ years before it finally(最后) __53__ us. Maybe nobody from the__54___ will ever visit that star __55__ it will take a rocket (火箭) a hundred thousand years to reach it.

46. A. for     B. because     C. since       D. from 

47. A. in     B. into           C. on         D. for 

48. A. its    B. his           C. their       D. there 

49. A. that     B. how          C. where        D. what 

50. A. it       B. sky         C. them         D. their

51. A. star     B. sun        C. moon            D. earth 

52. A. three    B. five           C. 100         D. four 

53. A. reaches to   B. gets        C. reaches          D. arrives

54. A. star      B. sun       C. moon            D. earth 

55. A. because   B. as if       C. though           D. why

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