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【参考答案】

在许多世纪里，它使南北美洲未被欧洲人发现。
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海员们担心他们会一直航行到地球边上掉落下去。
单项选择题
A．Old bikes are worth saving for their metal.B．Most metal comes from old hikes.C．Old bike lots should be saved.D．Metal can be saved for use in old bik
A．Old bikes are worth saving for their metal.
B．Most metal comes from old hikes.
C．Old bike lots should be saved.
D．Metal can be saved for use in old bik
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