单项选择题

Indeed, ______ may develop in behavior occurring between different species.

A．expectation
B．reciprocation
C．specification
D．visualization
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单项选择题
As unemployment began to ______, it may also have been true that those who were the first to be made redundant or were turned down for work were those who were least efficient.
A．escalate
B．augment
C．enlarge
D．enhance
单项选择题
He had been extremely ______ in dealing with the financial question.
A．tactful
B．courteous
C．lofty
D．shrewd
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