单项选择题

Many birds and insects can build ____________ nests to provide shelter for their young.

A．glorious
B．elaborate
C．splendid
D．appropriate
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单项选择题
The bicycle is a form of transport whose ____________ we take for granted.
A．expenditure
B．satisfaction
C．coordination
D．convenience
单项选择题
Fresh air is ____________ to good health. So you should go out more and take more fresh air.
A．fundamental
B．elementary
C．principal
D．dominant
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