单项选择题

To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least an ______ alternative energy source.

A．anticipated
B．official
C．equivalent
D．emotional
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单项选择题
He was widely regarded as a ______ man because he revealed daily his distrust of human nature and human motives.
A．disrespectful
B．cynical
C．confused
D．misinformed
单项选择题
Before 1500 North America was inhabited by more than 300 cultural groups , each with different customs, social structures, world views, and languages. Such diversity the existence of a single Native American culture.
A．complements
B．implies
C．reiterates
D．argues against
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