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
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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
单项选择题
Operation research is a scientific method of providing executive department with a quantitative basis for decisions ______ the operations under their control.
A. regarding
B. as to
C. on
D. considering
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