单项选择题

What is the main purpose of this passage（）

A．To look back to the early days of computers.
B．To explain what technical problems may occur with computers.
C．To discourage unnecessary investment in computers.
D．To warn against the blindness to the probable shortcomings of computers.

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They began to appreciate its simplicity and its deep meaning. It was a speech which only Abraham Lincoln could have made. (Passage 1 )
单项选择题
The (three-fields) system is an agricultural method in which one field (out of) (three) is (left) to lie fallow while the other two fields are being cultivated.
A. three-fields
B. out of
C. three
D. left
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