单项选择题

Statistics is a discipline ______all the other sciences.

A．affected
B．affecting
C．to be affected
D．being affected
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单项选择题
There are nations whose lack of contact with the outside world has______ poverty.
A．fallen into
B．consisted in
C．resulted in
D．come up to
单项选择题
We must______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
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