For thousands of millions of years the moon has been going round the earth. At that time, the moon was the  36 satellite(衛(wèi)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(軌道)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(大氣), 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

人類已發(fā)射了許多衛(wèi)星到太空去,它們在太空中運(yùn)轉(zhuǎn)。同時,人類還將宇宙飛船發(fā)射到太空中去,為人類揭開太空之謎。

36.【解析】選D。從常識以及下文的many other satellites可知在人造衛(wèi)星之前月亮是地球惟一(only)的衛(wèi)星。

37.【解析】選B。前后兩句間有轉(zhuǎn)折關(guān)系,所以用副詞however“然而”。

38.【解析】選C。根據(jù)下文These man-made satellites可知這些衛(wèi)星是人造衛(wèi)星。

39.【解析】選B。根據(jù)上文going round the earth可知這些衛(wèi)星繞著地球轉(zhuǎn)。

40.【解析】選A。根據(jù)下文的they travel in an orbit round the earth. 可知這些人造衛(wèi)星由于速度快所以不會掉(fall)下來。

41.【解析】選D。當(dāng)加速時,衛(wèi)星易于(tend to)進(jìn)入太空。

42.【解析】選A。衛(wèi)星離開(pull out of)地球,進(jìn)入軌道。

43.【解析】選B。地球重力阻止衛(wèi)星離開地球。keep. . . from doing . . . “阻止……做某事”。

44.【解析】選B。從上文可知衛(wèi)星會一直繞著地球轉(zhuǎn)。on and on“不停地”。

45.【解析】選A。本句介紹前句的原因。This is because. . . “這是因為……”。

46.【解析】選C。根據(jù)上下文可知大氣會使衛(wèi)星慢下來。slow sth. down“使……慢下來”。

47.【解析】選D。與上文above the atmosphere 構(gòu)成對應(yīng),所以使用lower。

48.【解析】選B。根據(jù)第二段第一句可知如果它的速度慢下來,衛(wèi)星會掉入(fall to)地球。

49.【解析】選C。人們已經(jīng)把宇宙飛船送上(send)了月球。

50.【解析】選A。由常識可知Mars(火星) and Venus(金星)是最近的(nearest)兩個星球。closest表示“最靠近的”。

51.【解析】選A。board the spaceship“在宇宙飛船上”。

52.【解析】選D。take photographs of“拍照”。

53.【解析】選B。根據(jù)下文可知the other side of the moon 是月球背朝地球的那一面。

54.【解析】選C。月球圍繞(circle)地球轉(zhuǎn)。

55.【解析】選D。根據(jù)上文提到的photographs 可知將照片(photos)發(fā)回地球。

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