单项选择题

Questions 17 to 20 are based.on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following does NOT give the sellers conveniences or advantages

A．Electronic cash registers.
B．Electronic recorders.
C．Credit cards.
D．Computers.

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单项选择题

单项选择题

Questions 17 to 20 are based.on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following does NOT give the sellers conveniences or advantages 您的浏览器不支持 audio 元素。