单项选择题
A.1/3 B.1/4 C.1/2 D.2/3
A.10%-20% B.10%―30% C.10%-40% D.10%-50%
A.90-100 B.70-75 C.75-77 D.60-63
A.1 B.1.5 C.2 D.2.5
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