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【参考答案】

twenty 改为 twentieth。
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单项选择题
A．The train seldom arrives on time.B．The schedule has been misprinted.C．The speakers arrived at the station late.D．The company has trouble printing a schedule.
A．The train seldom arrives on time.
B．The schedule has been misprinted.
C．The speakers arrived at the station late.
D．The company has trouble printing a schedule.
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.
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