单项选择题


A．broad
B．inclusive
C．tentative
D．extensive
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单项选择题
A．whileB．whereasC．ifD．although
A．while
B．whereas
C．if
D．although
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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