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问题
单项选择题
在电气上用红、绿、黄三色分别代表（）。
A.A、B、C
B.B、C、A
C.C、B、A
D.A、C、B
答案
参考答案：
C
选择题
It is said that the early European playing cards ____ for entertainment and education.
A. were being designed
B. have designed
C. have been designed
D. were designed
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判断题
税率是对征税对象的征收比例或征收额度，有比率税率和定额税率等好几种。（ ）
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