单项选择题

This assumption _________ that the forward rate is an impartial predictor of the future spot rate.

A．implies
B．declares
C．encloses
D．charges
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单项选择题
Its mere arrival on the scene will not _________ a revolution in education or in politics.
A．secure
B．assure
C．convince
D．ensure
单项选择题
This explains why even our most effective efforts to move people into jobs seem never to the welfare rolls.
A．squeeze
B．shrink
C．descend
D．decrease
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