单项选择题

What is the main purpose of this passage

A．To look back to the early days of this passage.
B．To explain what technical problems may occur with computers.
C．To discourage unnecessary investment in computers.
D．To warn against a mentally lazy attitude towards computers.

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单项选择题

The passage recommends those dealing with computers to ______.

A．be reasonably doubtful about them
B．check all their answers
C．substitute them for basic thinking
D．use them for business purposes only

单项选择题

A．foundB．discoveredC．cheatedD．followed

A．found
B．discovered
C．cheated
D．followed