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
Although he failed in the maths test, it was wrong to ______ at his efforts.
A．giggle
B．mock
C．grin
D．sneer
单项选择题
What is the attitude the author has towards eating meat
A．Positive.
B．Negative.
C．Indifferent.
D．Biased.
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