单项选择题

An investigation that is ______ can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.

A．timely
B．unguided
C．consistent
D．subjective
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单项选择题
After thirty years of television, people have become speed watchers . Consequently, if the camera lingers, the interest of the audience ______.
A．broadens
B．begins
C．varies
D．flags
填空题
how
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