阅读下列短文，从每小题所给的四个选项（A、B、C和D）中，选出最佳选项。
Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones
one hour apart, you can have days with more or fewer than twenty-four hours, and weeks with more or fewer
than seven days.
If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone (时区) every
day. As you enter each zone, the time changes the hour. Travelling west, you set your clock back; travelling
east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.
If you travel by ship across the Pacific you cross the International Date Line. By agreement, this is the
point where a new day begins. When you cross the line, you change your calendar the full day, backward or
forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow!
1. The best title for this passage is
.
[ ]
A. A Trip Across the Atlantic
B. How Time Changes Around the World
C. Crossing the International Date Time
D. How Time Zones Were Set up
2. From the passage it seems true that the Atlantic Ocean
.
[ ]
A. is in one time zone
B. is divided into twenty-four time zones
C. is divided into five time zones
D. cannot be crossed in five days
[ ]
3. The International Date Line is the name for
.
[ ]
A. the beginning of any new time zone
B. the point where time change by one hour
C. the point where a new day begins
D. any time zone in the Pacific Ocean
4. If you cross the ocean going east, you set your clock
.
[ ]
A. ahead one hour in each new time zone
B. ahead one time for the whole trip
C. back one full day for each one full day
D. ahead by twenty-three hours