单项选择题

Questions 18～20 are based on a monologue about e-commerce. You now have 15 seconds to read Questions 18～20.
Some people in the metal industry think only ______ products will be traded on the web.

A．standard and second class
B．high-tech
C．computer and software
D．industrial

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单项选择题

单项选择题

Questions 18～20 are based on a monologue about e-commerce. You now have 15 seconds to read Questions 18～20. Some people in the metal industry think only ______ products will be traded on the web. 您的浏览器不支持 audio 元素。