单项选择题

Robert was very stubborn and nobody could convince him ______ his mistakes.

A．at
B．of
C．with
D．by
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单项选择题
The Panama Canal was constructed in 1915 ______ three hundred fifty million dollars.
A．at half cost to
B．at a cost of
C．at any cost
D．at all costs
单项选择题
We are interested in the weather because it. ______ us so directly what we wear, what we do, and even how we feel.
A．affects
B．effects
C．guides
D．directs
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