四、阅读理解。
Strange things happen to time when you travel, because the earth is divided into twenty - four time zones(时区), 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 (大西洋),your ship enters a different time zone every day. As you enter each zone, the time changes one hour. If you travel west, you set your watch back. If you travel east, you set it ahead. Each day of your trip has either twenty - five or twenty - three hours.
If you make a trip by ship across the Pacific Ocean (太平洋),you cross the International Date Line (国际日期变更线). This is the point where a new day begins. When you cross the line, you change your calendar one full day. If you travel east, today becomes yesterday. If you travel west,it is tomorrow.
( ) 1. Something interesting will happen to the time when you travel because ______.
A. a day has always fewer than twenty - four hours
B. a day has always more than twenty - four hours
C. a day has more or fewer than twenty - four hours
D. sometimes zones are large and sometimes zones are small
( )2. If we cross the Atlantic Ocean, we ______.
A. change one full day B. set our watch back
C. set our watch ahead D. set our watch back or ahead
( )3. If we travel east across the International Date Line on July 5, the date becomes July ______.
A. 3 B. 4 C. 5 D. 6
( )4. The Atlantic Ocean ______.
A. is in one time zone B. is divided into twenty - four zones
C. is divided into five time zones D. can not be crossed in five days
( )5. Which of the following sentences is true?
A. If we travel around the world, we will get into trouble in telling the time.
B. If we travel west across the Atlantic Ocean, we will have twenty - three hours.
C. If we travel by ship across the Atlantic Ocean, we will cross the In - ternational Date Line.
D. If we travel across the Pacific Ocean, today becomes tomorrow.

1.C 2.D 3.B 4.C 5.A