Questions 7 to 10 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 effect will the increased use ofDM E、instead of diesel fuel probably have A、It will reduce the amount of pollutants in the air. B、It will increase the amount of unpleasant odors from vehicles. C、It will eventually destroy the ozone layer. D、It will reduce the cost of running large vehicles.
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