单项选择题

______, we keep records on all the experiments so that we may have enough data.

A．As a whole
B．As a rule
C．On the average
D．By all means
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单项选择题
Just as a married man cannot leave his work, a poor man cannot ______ to get sick.
A．have
B．go
C．expect
D．afford
单项选择题
Literature and art have a great influence ______ people's ideology.
A．to
B．on
C．for
D．onto
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