单项选择题

This difficult problem we face in the project has to be tackled before we can ______ to others.

A．pursue
B．advocate
C．precede
D．proceed
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单项选择题
Many animal can ______ with their surroundings because of their protective coloring.
A．integrate
B．match
C．blend
D．merge
单项选择题
Over the years jazz has changed and developed but it has essentially ______ its fundamental characteristics.
A．remained
B．retained
C．reserved
D．resumed
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