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
She took an umbrella with her this morning ______ she should be caught in the rain.
A．so that
B．in order that
C．in case
D．now that
单项选择题
______ the term is finished, I'm going to rest a few days and then take a trip.
A．Now that
B．Even if
C．As if
D．So that
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