单项选择题

To keep with the new developments in this field he ______ to a number of journals concerned with it.

A．subscribed
B．prescribed
C．subsidized
D．substituted
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单项选择题
A ______ to this problem is expected to be found before long.
A．result
B．response
C．settlement
D．solution
单项选择题
As an excellent shooter, Peter practiced aiming at both ______ targets and moving targets.
A．standing
B．stationary
C．still
D．stable
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