A、The problems of environment pollution. B、A material which can save fuel. C、The installation of pollution filters. D、The way to

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问题

选项 A、The problems of environment pollution.
B、A material which can save fuel.
C、The installation of pollution filters.
D、The way to spray a coat on the engines.

答案B

解析 对话中后面,两人讨论的是一种被称作coniine oxide的绝缘材料及其作用,故选B)项。
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