单项选择题
A.5~10 B.10~15 C.15~20 D.20~25
A.12 B.15 C.17 D.19
A.1/2 B.2/3 C.3/4 D.4/5
A.40%~60% B.40%~70% C.50%~70% D.50%~80%
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