单项选择题

Questions 8 to i0 are based on the following conversation. At the end of the conversation; you will be given 15 seconds to answer the questions. NOW listen to the conversation. What does the woman mention as a disadvantage of the process she describes

A．It hasn’t been fully tested.
B．It’s quite expensive.
C．It uses up scarce minerals.
D．The gas it produces is harmful to the environment.

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单项选择题

单项选择题

Questions 8 to i0 are based on the following conversation. At the end of the conversation; you will be given 15 seconds to answer the questions. NOW listen to the conversation. What does the woman mention as a disadvantage of the process she describes 您的浏览器不支持 audio 元素。