单项选择题

Garlic was once known as "the stinking rose", and has been used throughout the centuries to purify the blood and ______ heart disease.

A．back off
B．buy off
C．ward off
D．doze off
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单项选择题
Indeed, ______ may develop in behavior occurring between different species.
A．expectation
B．reciprocation
C．specification
D．visualization
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
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