单项选择题
A.3000-5000B.4000-6000C.5000-7000D.6000-8000
A.C15B.C20C.C25D.C30
A.20-40B.30-50C.40-60D.50-70
A.60%-70%B.65%-75%C.70%-80%D.75%-85%
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