A、Letters of credit B、Electronic funds-transfer technology C、Credit cards D、Traveler’ s checks B根据录音原文，B选项符合题意。

We will live in a society when cash no longer exists. Instead, "cash" would be electronic, as in bank-card systems. Notes and coins would be abandoned. Its benefits would be profound and fundamental. Theft of cash would become impossible. Bank robberies and cash-register robberies would cease to occur. Urban streets would become safe. Retail shops in once dangerous areas could operate in safety. Neighborhoods would improve.
    National electronic-money system would operate as a debit-card system. Each individual’ s money would be held in his money-system account. A transaction would affect an instant transfer of money from his account to that of another account holder. Only cash would be supplanted by electronic money. Credit card and automatic-teller-machine system would not necessarily change, although you could no longer obtain cash at ATMs.
27. In future, what kind of form will the money be?
28. According to the passage, why would the neighborhoods improve?
29. What make(s)it possible to divorce money from evil?
30. According to the passage, which of the following statements is false?