[多选题]2×20年12月10日,甲公司承诺以每件100元的价格向乙公司销售120件A产品。产品在6个月内转移给乙公司。甲公司在某个时点转移每一件产品的控制权。2×21年3月20日,当甲公司向乙公司转移了60件A产品的控制权后,合同进行了修改,要求向乙公司额外交付30件产品(即总数为150件相同的产品)。这额外的30件产品并未包括在原合同中。在协商购买额外30件产品的过程中,合同双方最初商定
每件产品价格为80元(未反映单独售价)。此外,乙公司发现已收到的60件产品存在独有的瑕疵,甲公司因这些劣质产品向客户进行赔偿,承诺每件产品优惠15元,即额外30件产品的实际价款为1 500元(2 400-900)。甲公司下列会计处理的表述中,正确的有( )。
A.原60件瑕疵产品优惠900元应冲减2×21年3月主营业务收入
B.原合同尚未提供的60件产品单独售价为100元
C.剩余产品单价为93.33元
D.新增合同尚未提供的30件产品单独售价为50元

[听力原文] 11-15
We do not know when men first began to use salt, but we do know that it has been used in many different ways through out history. Historical evidence shows, for example, that people who lived over 3 000 years ago ate salted fish. Thousands of years ago in Egypt, salt was used to keep the dead from decaying.
 Stealing salt was considered a crime during some periods of history. In the 18th century for instance, if a person were caught stealing salt, he could be put in jail. History records that about ten thousand people were put in jail during that century for stealing salt! About 150 years before, in the year 1553 ,taking more than one’s share of salt was punished as a crime. The offender’s ear was cut off!
 Salt was an important item on the table of a king. It was traditionally placed in front of the king when he sat down to eat. Important guests at the king’s table were seated near the salt. Less important guests w

混合所有制经济是指财产权分属于不同性质所有者的经济形式。发展国有资本、集体资本、非公有资本等交叉持股、相互融合的混合所有制经济（）
①是社会主义初级阶段基本经济制度的重要实现形式
②有利于我国的各种所有制资本相互促进、共同发展
③使各种所有制经济平等竞争以增强对经济的控制力
④可以确保公有资产在我国的社会总资产中占有优势