单项选择题

Iron and steel expands when heated and_______when cooled.

A．shrinks
B．contracts
C．condenses
D．compresses
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He_______our warning and ended up in trouble.
A．neglected
B．ignored
C．distrusted
D．disliked
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There were comparatively_______people at the exhibition.
A．less
B．few
C．fewer
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