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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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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A．Family phone numbers.B．Government service phone numbers.C．Business phone numbers.D．Professional services phone numbers.
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