单项选择题

Obsessed with their research on superconductive material, they were oblivious of the goings-on around them.

A．afraid of
B．amazed at
C．familiar with
D．unaware of
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单项选择题
Recurrent showers were forecast for the day.
A．Recuperative
B．Intermittent
C．Instantaneous
D．Frequent
单项选择题
A careful screeningof the disease will lessen the patients anxiety.
A．showing
B．hiding
C．investigation
D．projection
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