单项选择题

Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved.

A．yield
B．succumb
C．subject
D．resort
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单项选择题
The middle-aged woman has been ______ with a serious illness for half a year; she is dying now.
A．laid down
B．laid off
C．laid up
D．laid in
单项选择题
It is not enough to observe behavior and ______ them with physiological events that occur at the same time.
A．correlate.
B．comply
C．correspond
D．pertain
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