单项选择题

The chief reason for the population growth isn't so much a rise in birth rates ______ a fall in death rates as a result of improvements in medical care.

A．and
B．as
C．but
D．or
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单项选择题
The Social Security Retirement Program is made up of two trust funds, ______ could go penniless by next year.
A．the larger one
B．the larger of which
C．the largest one
D．the largest of which
单项选择题
Andrew, my father' s younger brother, will not be at the picnic, ______ to the family' s disappointment.
A．much
B．more
C．too much
D．much more
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