单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Making new discoveries in the electronics industry.
B．Designing printers.
C．Selling printers.
D．Looking for successful products and find out the reasons.

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单项选择题

A．It is interesting and exciting.B．It is perfect without any limitations.C．It is supported by the government.D．Its conclusion can be universally accepted.

A．It is interesting and exciting.
B．It is perfect without any limitations.
C．It is supported by the government.
D．Its conclusion can be universally accepted.

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 19 to 21 are based on the conversation you have just heard.