单项选择题

The cost of living in Liberia, West Africa, has ______ in the past five years because of the internal conflicts.

A．skyrocketed
B．outer-spaced
C．overestimated
D．under-questioned
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单项选择题
The rock music made popular by the Beatles has been modified over the past two decades.
A．improved
B．changed
C．discovered
D．remembered
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Mary is ambitious enough to ______ conversational fluency in Chinese in two months.
A．aim at
B．inspire
C．seek
D．aspire to
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