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
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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
单项选择题
Many animal can ______ with their surroundings because of their protective coloring.
A．integrate
B．match
C．blend
D．merge
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