D. Cash transactions are abstract and difficult for most people to understand.

D.现金交易是抽象的，对大多数人来说很难理解。

In Sweden the number of retail cash transactions per person has fallen by 80% in the past ten years.

在过去的十年里，瑞典人均零售现金交易数量下降了80%。

Nickels are worth five cents each. That's because the government has advised shop owners to round out prices to the nearest nickel for cash transactions.

一镍币等于五分。那是因为政府建议店主把商品价格调整到最近的镍币，以便用镍币进行交易。

The U.S. National Association of Convenience Stores calculated that handling pennies adds 2 to 2.5 seconds to each cash transaction.

美国全国便利店协会计算出，处理便士会使每笔现金交易增加 2 到 2. 5 秒。