单项选择题

The integration of independent states (could best be) brought about by (first) creating a central organization (with authorities) over (technical) economic tasks.

A．could best be
B．first
C．with authorities
D．technical
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单项选择题
. I don't think it's wise of you to ____________ your greater knowledge in front of the director, for it may offend him.
A．show up
B．show out
C．show in
D．show off
单项选择题
A thorough study of biology requires ____________ with the properties of trees and plants, and the habit of birds and beasts.
A．acquisition
B．discrimination
C．curiosity
D．familiarity
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