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
The constitutional guarantee of free speech may have been aimed at protecting native speakers of English from censorship, but it is not a great ______ to interpret it as protecting the right to express oneself in any natural language or dialect.
A．mystery
B．extension
C．sacrifice
D．condemnation
单项选择题
Her lecture gave us a sense of how empty the universe is, in spite of ______ number of stars within it.
A．varying
B．enormous
C．unusual
D．limited
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