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
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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
单项选择题
Difficulties and hardships have ______ the best qualities of the young geologist.
A．brought up
B．brought out
C．brought about
D．brought forth
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