单项选择题

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
A．Because she didn’’t find suitable courses.B．because the summer courses of this year were the same as before.C．Because her friends persuaded her to do so.D．Because she wants to do some different things.
A．Because she didn’’t find suitable courses.
B．because the summer courses of this year were the same as before.
C．Because her friends persuaded her to do so.
D．Because she wants to do some different things.
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