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 difference in time between zones is______.
A．twenty-four hours
B．seven days
C．one hour
D．more than seven days
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
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