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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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
单项选择题
I've kept up a friendship with a girl whom I was at school ____________ twenty years ago.
A．about
B．since
C．till
D．with
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