单项选择题

The computer is important to the air line because ______.

A．it sells tickets
B．it writes out tickets
C．it gives the information needed
D．it knows when a plane takes off.
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单项选择题
The best headline for the article is ______.
A．When the Computer Is Down
B．The Most Frightening Words
C．The Computer of the Airport
D．Asking the Computer
单项选择题
The last paragraph suggests that ______.
A．a modern computer won’t be down
B．computers can take the place of humans
C．sometimes a computer may bring suffering to people
D．there will be great changes in computers
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