第三节：完形填空（共15小题；每小题1分，满分15分）
阅读下面短文，掌握其大意，然后从51～65题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
Strange things happen to time when you travel. 51 the earth is divided into 24 time zones, one hour apart, you can have days with 52 or fewer than 24 hours, and weeks with more or fewer than seven days.
If you 53 a five-day trip across the Atlantic Ocean, your 54 enters a different time zone every 55 . As you enter each zone, the time 56 one hour. Traveling west, you set your clock back; traveling east, you set it 57 . Each day of your trip has 58 25 or 23 hours.
If you travel by ship across the Pacific, you 59 the international date line. By agreement, this is the point _60 a new day begins. 61 you cross the line, you change your 62 one full day, backward 63 forward. Traveling east, today 64 yesterday; traveling west, 65 is tomorrow!
51. A. Because B. If C. Although D. When
52. A. much B. more C. many D. less
53. A. do B. make C. go D. travel
54. A. plane B. train C. car D. ship
55. A. day B. night C. hour D. time
56. A. goes B. changes C. shows D. adds
57. A. ahead B. upward C. backward D. fast
58. A. neither B. either C. both D. nor
59.A. travel B. trip C. cover D. cross
60.A. which B. what C. that D. where
61.A. When B. Where C. While D. Before
62.A. time B. calendar C. date D. hour
63.A. and B. or C. but D. still
64.A. changes B. makes C. bees D. goes
65.A. which B. this C. that D. itABBDA BABDD ABBCD
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(答案→)ABBDA BABDD ABBCD
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