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.
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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.
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.
单项选择题
A．He set up the first university in America.B．He was one of the earliest settlers in America.C．He can best represent the spirit of early America.D．He was the most distinguished diplomat in American history.
A．He set up the first university in America.
B．He was one of the earliest settlers in America.
C．He can best represent the spirit of early America.
D．He was the most distinguished diplomat in American history.
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