单项选择题

A．Pollution of the environment.
B．A new generation of pesticides.
C．Over-killing by hunters.
D．Destruction of the natural homes of bald eagles.
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单项选择题
A．Bone structure.B．Smell ability.C．Birth mode.D．Recover ability against disease.
A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against disease.
单项选择题
A．His professor.B．Nobody.C．Someone else.D．The author.
A．His professor.
B．Nobody.
C．Someone else.
D．The author.
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