单项选择题

Many houses in the north are warm in winter because they are ______ so that the beat is not lost.

A．isolated
B．insulated
C．imparted
D．integrated
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单项选择题
American justice works on the ______ that an accused person is innocent until they are proved guilty.
A．allegation
B．pledge
C．premise
D．proclamation
单项选择题
He refused the invitation to dinner on the ______ of being too busy.
A．excuse
B．ground
C．plea
D．point
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