单项选择题

According to the speaker, what is the possible danger facing bald eagles（）

A．Pollution of the environment.
B．Over-killing by hunters.
C．Destruction of their natural homes.
D．A new generation of pest killers.

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单项选择题
What has happened since the end of the ice age（）

A．Many species have developed a habit of migration.
B．Many species have become less sensitive to climate.
C．Many new species have come into existence.
D．Many species have moved further north.
单项选择题
What measure did the wildlife biologists take to in- crease the number of bald eagles（）

A．They brought in bald eagles from Canada.
B．They explored new ways to hatch baby bald eagles.
C．They developed new types of feed for baby bald eagles.
D．They found ways to speed up the reproduction of bald eagles.
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