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For thousands of millions of years the moon has been going round the earth. At that time, the moon was the  36 satellite(卫星)of the earth. Today,  37 , the earth has many other satellites. All of them are 38 by man. These man-made satellites are very much smaller than the moon. However, some of them will still be going 39 the earth thousands of years from now.

Man-made satellites don’t 40 because they are going too fast to do so. As they speed along, they 41 to go straight off into space. They 42 out of the earth, or its gravity, which 43 them from doing this. As a result, they travel in an orbit(轨道)round the earth.

If a man-made satellite travels about at a certain height, it can keep going 44 round the earth, just like the moon. This is 45 it is above the atmosphere(大气), and there is nothing to 46 it down. If it travels 47 than that, it will be slowed down so much that it will 48 the earth.

Men have 49 spaceships to the moon and to the two 50 planets Mars(火星) and Venus(金星). By putting a camera on 51 the spaceship to the moon, men have been able to 52 photographs of the other side of the moon. This side is always 53 from us as the moon 54 the earth. The 55 were later transmitted by radio to the earth. They showed that the other side of the moon is very much the same as the side that turns towards us.

36. A. first       B. second         C. last           D. only

37. A. then      B. however        C. though         D. so

38. A. found     B. discovered      C. made          D. sent

39. A. with      B. round          C. behind         D. after

40. A. fall       B. rise            C. break         D. stop

41. A. want     B. wish          C. hope          D. tend

42. A. pull      B. push           C. take           D. launch

43. A. protects  B. keeps          C. makes         D. discourages

44. A. in and in  B. on and on       C. out and out     D. up and up

45. A. because  B. why            C. whether        D. when

46. A. hand     B. force          C. slow           D. bring

47. A. higher    B. longer           C. more          D. lower

48. A. leave away      B. fall to   C. go after         D. knock over

49. A. gave     B. offered          C. sent          D. drove

50. A. nearest   B. smallest         C. biggest       D. closest

51. A. board    B. right           C. left           D. top

52. A. form     B. film            C. catch        D. take

53. A. far       B. hidden         C. different       D. separated

54. A. leads      B. obeys          C. circles        D. pursues

55. A. information  B. letters         C. sounds       D. photos

人类已发射了许多卫星到太空去,它们在太空中运转。同时,人类还将宇宙飞船发射到太空中去,为人类揭开太空之谜。

36.【解析】选D。从常识以及下文的many other satellites可知在人造卫星之前月亮是地球惟一(only)的卫星。

37.【解析】选B。前后两句间有转折关系,所以用副词however“然而”。

38.【解析】选C。根据下文These man-made satellites可知这些卫星是人造卫星。

39.【解析】选B。根据上文going round the earth可知这些卫星绕着地球转。

40.【解析】选A。根据下文的they travel in an orbit round the earth. 可知这些人造卫星由于速度快所以不会掉(fall)下来。

41.【解析】选D。当加速时,卫星易于(tend to)进入太空。

42.【解析】选A。卫星离开(pull out of)地球,进入轨道。

43.【解析】选B。地球重力阻止卫星离开地球。keep. . . from doing . . . “阻止……做某事”。

44.【解析】选B。从上文可知卫星会一直绕着地球转。on and on“不停地”。

45.【解析】选A。本句介绍前句的原因。This is because. . . “这是因为……”。

46.【解析】选C。根据上下文可知大气会使卫星慢下来。slow sth. down“使……慢下来”。

47.【解析】选D。与上文above the atmosphere 构成对应,所以使用lower。

48.【解析】选B。根据第二段第一句可知如果它的速度慢下来,卫星会掉入(fall to)地球。

49.【解析】选C。人们已经把宇宙飞船送上(send)了月球。

50.【解析】选A。由常识可知Mars(火星) and Venus(金星)是最近的(nearest)两个星球。closest表示“最靠近的”。

51.【解析】选A。board the spaceship“在宇宙飞船上”。

52.【解析】选D。take photographs of“拍照”。

53.【解析】选B。根据下文可知the other side of the moon 是月球背朝地球的那一面。

54.【解析】选C。月球围绕(circle)地球转。

55.【解析】选D。根据上文提到的photographs 可知将照片(photos)发回地球。

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