They trade ___ cotton piece goods with other countries ______ th

They trade ___ cotton piece goods with other countries ______ the basis of equality.
【正确答案】：in, on
【题目解析】：【考点点击】本题主要考查介词搭配。【要点透析】trade in sth.表示“经营"；on the basis of表示“在....的基础上”。