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．The high temperatures required for its use.B．The high cost of materials used in its production.C．The lack of trained environmental engineers.D．The opposition of automobile manufacturers.
A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
填空题
therefore
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