单项选择题

The "international date line" can be best defined (给......下定义) as

A．the beginning of a new traveling day
B．the border(边界) of two countries
C．the point where a new day begins
D．the place where an agreement can be exchanged(交换)

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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

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