单项选择题

A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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单项选择题
A．Many species have moved further north.B．Many new species have come into existence.C．Many species have developed a habit of migration.D．Many species have become less sensitive to climate.
A．Many species have moved further north.
B．Many new species have come into existence.
C．Many species have developed a habit of migration.
D．Many species have become less sensitive to climate.
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