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【参考答案】

twenty 改为 twentieth。
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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.
A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
单项选择题
A．He believes the Browns have done a sensible thing.B．He doesn’t think the Browns should move to another place.C．He doesn’t think the Browns’ investment is a wise move.D．He believes it is better for the Browns to invest later.
A．He believes the Browns have done a sensible thing.
B．He doesn’t think the Browns should move to another place.
C．He doesn’t think the Browns’ investment is a wise move.
D．He believes it is better for the Browns to invest later.
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