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 is the conversation mainly about

A．A new fuel for buses.
B．The causes of air pollution.
C．A way to improve fuel efficiency in buses.
D．Careers in environmental engineering.

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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 is the conversation mainly about 您的浏览器不支持 audio 元素。