单项选择题

In the man's opinion something happened to the flying saucer when______

A．it was carrying out a mission
B．it was flying back to outer space
C．it was landing in a field
D．people aboard were repairing a damage
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单项选择题
The author thinks of the explanation given by the army as______
A．ridiculous
B．not capable of proof
C．adequate
D．scientific though seemingly simple .
单项选择题
According to the author, the concept of people-literate in para. 2 means______
A．to make the computer learn to understand people
B．to bring computers closer to the people
C．that all the people should understand computers
D．that all the people should learn to use computers
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