单项选择题

The speed with which an electronic computer works depends on its（）

A．electronic circuits
B．programmer
C．vacuum tubes, or transistors
D．instructions

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单项选择题
The International Date Line is the name for（）

A．any point where time changes by one hour
B．the beginning of any day begins
C．the point where a new day begins
D．any time zone in the Pacific Ocean
单项选择题
From this selection it seems true that the Atlantic Ocean（）

A．is divided into twenty-fore zones
B．is one time zone
C．is divided into five time zones
D．cannot be crossed in five days
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