单项选择题
In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden se
A． permanentlyB. imperceptiblyC. irregularlyD. precariously
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单项选择题
A careful ______ of the house revealed no clues.
A．dissemination
B．pursuit
C．ornamentation
D．examination
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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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