单项选择题

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.
According to the conversation, DME won’t be on the market soon because

A．it’s expensive to manufacture.
B．it hasn’t been adequately tested.
C．it damages car engines.
D．it’s dangerous to transport.

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单项选择题

单项选择题

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. According to the conversation, DME won’t be on the market soon because 您的浏览器不支持 audio 元素。