单项选择题

It is now impossible to assess whether such research is of an ______ or defensive nature.

A．active
B．offensive
C．alive
D．optional
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单项选择题
This old man lives more in the present than in the past and ______ sports in a big way.
A．falls back on
B．ends up with
C．goes in for
D．comes up with
单项选择题
A ______ contest is intended to eliminate less qualified competitors before decisive contests.
A．fundamental
B．deliberate
C．preliminary
D．tough
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