A; differential B;tariff C;facilitate D;eliminate E;integration
1.to remove or get rid of sth/sb
2.the act or process of combining two or more things so that they work together
3.to make an action or a process possible or easier
4.showing or depending on a difference;no equal
5. a tax that is paid on goods coming into or going out of a country
顺便解释选择词的意思，谢谢！
