单项选择题

Some students have got together to advocate a system ____________ student work without grades.

A．modifying
B．estimating
C．evaluating
D．inspecting
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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
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
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