单项选择题

How do we explain this variation, and how do we explain the __________ of this adaptation from one generation to another

A．transmission
B．transfer
C．transformation
D．transportation
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Differences emerge in three ways: argument, competition, and conflict--which alone is __________ wholly harmful.
A．admitted
B．acknowledged
C．absorbed
D．considered
单项选择题
The cheapest doctor we could find __________ us fifty dollars for a five-minute examination.
A．expended
B．offered
C．cost
D．charged
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