单项选择题

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

A．insulated
B．insulted
C．imitated
D．initiated
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单项选择题
Travelers in space have to ______ many discomforts in their spaceships.
A．maintain
B．persist
C．endure
D．sustain
单项选择题
Smoking should be banned in public places and great efforts should be made to inform young people of the ______ consequences of taking up the habit.
A．graphic
B．fake
C．fabulous
D．grave
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