单项选择题

A．To choose a topic for a term paper.
B．To type some research materials.
C．To find material not available at the main library.
D．To learn to use the computers there.
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单项选择题
The word logged (Line 4, Para. 5) most probably means ______ .
A．preset
B．entered
C．processed
D．simulated
单项选择题
To produce artificial noses for practical use, it is essential______.
A．to develop microchips with thousands of odor receptors
B．to invent chips sensitive to various chemicals
C．to design a computer program to sort out smells
D．to find chemicals that can alter the electrical current passing through
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