单选题 Regressive taxes (税率递减税)tax rich and poor equally. An example of them is the gasoline(汽油) tax. The person who makes $30 000 a year and the person who makes $7 000 a year pay the same gasoline tax despite great difference in their incomes. Most governments have settled on a mixture of progressive(累进税率的)and regressive taxes. This mixture enables governments to collect as much revenue as possible through the most practical means.