单项选择题

The purpose of the writer in writing the passage is ______.

A．to give an objective account of the e-nose
B．to question the wide use of the e-nose
C．to discuss the advantages of the e-nose over the human nose
D．to encourage the introduction of the e-nose to the market at a lower price
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单项选择题
It can be learned from the passage that ______.
A．the artificial noses are even better than the human noses
B．it has not taken long for the artificial noses to be introduced to the market
C．the attempts of the artificial noses to imitate the olfactory abilities have been largely unsuccessful
D．the artificial noses have their own advantages over the human noses
单项选择题
It can be inferred from the passage that ______.
A．scientists have discovered the working mechanism of the nose
B．humans detect odors with a large number of receptors responsive to the odorous molecules themselves
C．the receptors integrate various responses to the characteristics of an odor and store them in the brain
D．e-noses operate on principles totally different from those of a real nose
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