单项选择题
A.1 B.2 C.3 D.4
A.80% B.90% C.70% D.50%
A.3.5,.1/125 B.4,1/60 C.2.8,1/15 D.8,,1/60
A.红、绿、蓝 B.红、黄、蓝 C.品红、黄、青
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