单项选择题

The main reason for the fast growth of population is not ______ a rise in birth rates as a fall in death rates as a result of improvements in public health service and medical care.

A. such
B. the same
C. so much
D. as much
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单项选择题
If people do not tell ______ for an electronic computer to do, it will accomplish nothing. This is the reason why electronic computers will never be able to replace man.
A. that
B. what
C. how
D. when
单项选择题
______ scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else.
A. Until
B. Since
C. Once
D. Even if
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