单项选择题

The difference in time between zones is _________.

A．twenty-four hours
B．one hour
C．seven days
D．one day
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单项选择题
When you cross the Atlantic Ocean traveling west, you should set clock
A．back one hour in each new time zone
B．back one hour for the whole trip
C．ahead one hour in each new time zone
D．ahead one hour for the whole trip
单项选择题
According to the passage, it is believed that the Atlantic Ocean can be divided into _________ time zones.
A．2
B．3
C．4
D．5
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