单项选择题 佣金是

判断题 婚姻制度是随着人类的产生而产生的，有人类时就有婚姻制度 A、正确 B、错误

单项选择题 The total cost of one product’s export is CNY14,000, and the net income of foreign of export is USD2,500. If the foreign exchange quoted by Bank of China is CNY680 for USD100, then the Export Profit Margin should be:A.18.5%B.21.43%C.16.6%D.23.65%