单项选择题

A．It limited their supply of food.
B．It made their eggshells too fragile.
C．It destroyed many of their nests.
D．It killed many baby bald eagles.
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单项选择题
Exercise can benefit those who suffer from loneliness.
A．Y
B．N
C．NG
单项选择题
A．Once.B．Twice.C．Thrice.D．Four times.
A．Once.
B．Twice.
C．Thrice.
D．Four times.
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