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．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
单项选择题
A．A class presentation they’re preparing.B．A television program the man is watching.C．Visiting a close fiend of theirs.D．Studying for a test.
A．A class presentation they’re preparing.
B．A television program the man is watching.
C．Visiting a close fiend of theirs.
D．Studying for a test.
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