单项选择题

She remains confident and ______ untroubled by our present problems.

A．indefinitely
B．infinitely
C．optimistically
D．seemingly
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单项选择题
There should be room for programs of world news within children's ______ .
A．range
B．scope
C．room
D．sight
单项选择题
A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.
A．calls for
B．calls on
C．calls up
D．calls forth
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