单项选择题

A．Separate houses were built for storing ice.
B．Double walls were built in icehouses to keep cool.
C．Blocks of ice were packed with hay in icehouses.
D．Ice was put into icehouses in winter.
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单项选择题
A．It limited their supply of food.B．It killed many baby bald eagles.C．It destroyed many of their nests.D．It made their eggshells too fragile.
A．It limited their supply of food.
B．It killed many baby bald eagles.
C．It destroyed many of their nests.
D．It made their eggshells too fragile.
单项选择题
A．A new fuel for buses.B．The causes of air pollution.C．A way to improve fuel efficiency in buses.D．Careers in environmental engineering.
A．A new fuel for buses.
B．The causes of air pollution.
C．A way to improve fuel efficiency in buses.
D．Careers in environmental engineering.
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