单项选择题

Questions 8 to 10 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 10 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。