单项选择题

The main 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．but
C．or
D．as
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单项选择题
I have kept that photo ______ I can see it every day, as it reminds me of my university days in London.
A．which
B．when
C．whether
D．where
单项选择题
______ he will leave for Beijing.
A．It will not be long before
B．It is before long that
C．It is before long
D．It was before long that
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