单项选择题

A．source
B．origin
C．resource
D．base
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单项选择题
What was the main harmful effect of the pest’s killer DDT on bald eagles
A．It limited their supply of food.
B．It destroyed many of their nests killed
C．It many baby bald eagles.
D．It made their eggshells too fragile.
填空题
8 ounce
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