单项选择题

The US biodefence research is particularly controversial because of the sheer ______ of the effort.

A．latitude
B．magnitude
C．aptitude
D．attitude
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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
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
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