单项选择题
A.1/4~2/3 B.1/3~2/3 C.1/2~1/3 D.1/2~2/3
A.<40 B.≤40 C.≥40 D.>40
A.1/3 B.2/3 C.1/2 D.3/4
A.18 B.20 C.22 D.24
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