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.
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单项选择题
Considering natural resources, what should Americans do according to the passage
A．They should use less and waste less.
B．They should try to help the developing countries with the conversation of resources.
C．They should raise money in order to protect the natural resources.
D．They should be united as one to fight against the destruction of forests.
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