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
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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.
单项选择题
From the passage we can conclude that______.
A．the writer used to cut very beautiful Christmas tree
B．his mother didn't like perfect trees
C．his mother didn't want to have a pine tree
D．the writer wouldn’t have a tree cut by someone else
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