单项选择题

Some scientists are dubious of the claim that organisms ______ with age as an inevitable outcome of living.

A．depress
B．default
C．deteriorate
D．degrade
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单项选择题
California has more light than it knows ______ to do with but everything else is expensive.
A．how
B．what
C．which
D．where
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
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