单项选择题
A.5~8B.3~4C.10~12D.14~16
A.40B.20C.90D.50
A.1/10~1/5B.1/3~1/2C.3/5~7/10D.4/5~9/10
A.1~2B.3~4C.5~10D.12~16
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