单项选择题

It's a result more of ______ than anything else to win the top prize in a lottery.

A．effort
B．opportunity
C．blessing,
D．chance
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单项选择题
The camps are not usually tent-tupe camps. They are mostly long-established ______ structures, often with strange Indian names.
A．permanent
B．monotonous
C．raw
D．historical
单项选择题
If more short journeys were made by bicycles, energy could be saved and pollution ______.
A．declined
B．reduced
C．dropped
D．decreased
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