单项选择题

Which of the following is closest in meaning to the phrase "looking up"(Line 1, Para. 2)

A．Raising one's eyes.
B．Turning better.
C．Searching for.
D．Paying a visit.
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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
According to the passage, more and more tiny e-noses are meeting the requirements of human noses because of______.
A．improvements in chip technology and pattern-recognition' techniques
B．disease detection and disaster prevention
C．expensive prices and prompt introduction of the models
D．improvements in the olfactory abilities of our built-in sensors
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