[单项选择]In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.
Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 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 engineerin

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