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
Economics is a subject that ______ all people's lives whether they are conscious of it or not.
A．draws on
B．catches on
C．touches on
D．embarks on
单项选择题
It is a ______ that in such a rich and prosperous country there should be so many poverty - stricken people.
A．controversy
B．paradox
C．aversion
D．conversion
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