单项选择题

She worked hard at her task before she felt sure that the results would ______ her long effort.

A．justify
B．testify
C．rectify
D．verify
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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
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
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