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 bike.
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问答题
在许多世纪里，它使南北美洲未被欧洲人发现。
单项选择题
A．tighter and tighterB．tight and tightC．tight for tightD．tighter for tighter
A．tighter and tighter
B．tight and tight
C．tight for tight
D．tighter for tighter
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