阅读下面短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Strange things happen to time when you travel. _
_11___the earth is divided into24 time zones, one hour apart, you can have days with
__12___ or fewer than 24 hours, and weeks with more or fewer than seven days.
If you _
_13___ a five-day trip across the Atlantic Ocean, your __
14___ enters a different time zone every _
_15___. As you enter each zone, the time _
_16___ one hour. Traveling west, you set your clock back; traveling east, you set it __
17___. Each day of your trip has _
_18___ 25 or 23 hours.
If you travel by ship across the Pacific, you _
__19___ the internationaldate line. By agreement, this is the point __
20___ a new day begins. _
_21___ you cross the line, you change your
__22___ one full day, backward _
_23____ forward. Traveling east, today __
24___ yesterday; traveling west,
__25___ is tomorrow!
小题1:
| A．Because | B．If | C．Although | D．When |
小题2:
小题3:
小题4:
| A．plane | B．train | C．car | D．ship |
小题5:
小题6:
| A．goes | B．changes | C．shows | D．adds |
小题7:
| A．ahead | B．upward | C．backward | D．fast |
小题8:
| A．neither | B．either | C．both | D．nor |
小题9:
| A．travel | B．trip | C．cover | D．cross |
小题10:
| A．which | B．what | C．that | D．where |
小题11:
| A．When | B．Where | C．While | D．Before |
小题12:
| A．time | B．calendar | C．date | D．hour |
小题13:
小题14:
| A．changes | B．makes | C．becomes | D．goes |
小题15:
