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:
A．much
B．more
C．many
D．less小题3:
A．do
B．make
C．go
D．travel小题4:
A．plane
B．train
C．car
D．ship小题5:
A．day
B．night
C．hour
D．time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:
A．and
B．or
C．but
D．still小题14:
A．changes
B．makes
C．becomes
D．goes小题15:
A．which
B．this
C．that
D．it