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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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
He wasn't asked to take on the chairmanship of the society, ____________ insufficiently popular with all members.
A．being considered
B．considering
C．to be considered
D．have considered
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