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
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
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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