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．Call on people to protect sharks.B．Point out the living environment of sharks.C．Explain why the sharks are dangerous.D．An introduction to sharks.
A．Call on people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.
单项选择题
A．Memories of a recent storm.B．How strong winds develop into a hurricane.C．Weather patterns that can affect Florida.D．Planning a summer vacation.
A．Memories of a recent storm.
B．How strong winds develop into a hurricane.
C．Weather patterns that can affect Florida.
D．Planning a summer vacation.
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