单项选择题

______ that this region was so rich in natural resources.

A．Little he knew
B．Little did he know
C．Little he did know
D．Little he had know
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单项选择题
When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ______ electronically into a pattern of lines.
A．relieved
B．converted
C．magnified
D．burst
单项选择题
One of the most spectacular qualities of man is notably his ______ to any kind of natural environment.
A．inclination
B．domination
C．adaptability
D．availability
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