单项选择题

In education there should be a good ______ among the branches of knowledge that contribute to effective thinking and wise judgment.

A．distribution
B．balance
C．combination
D．assignment
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单项选择题
Life insurance is financial protection for dependents against loss ______ the bread -winner's death.
A．at the cost of
B．on the verge of
C．as a result of
D．for the sake of
单项选择题
Although architecture has artistic qualities, it must also satisfy a number of important practical ______.
A．obligations
B．regulations
C．observations
D．considerations
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