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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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
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A．surprise in his faceB．wonder in his faceC．puzzle on his faceD．fear in his face
A．surprise in his face
B．wonder in his face
C．puzzle on his face
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