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  3. What is the one huge problem that we haven’t really solved? [br] The electrostat

What is the one huge problem that we haven’t really solved? [br] The electrostat

游客2023-09-15  33
问题 What is the one huge problem that we haven’t really solved? [br] The electrostatic precipitator has got rid of ______ from manufacturing processes.
选项 A、severe emissions
B、ozone-layer depletion
C、many pollutants
D、toxic substances
答案 D
解析 细节题。根据题干from manufacturing processes定位到第四个小标题末段首句Other inventions, such as an enormous device known as the electrostatic precipitator, have reduced severe emissions from power-plant smokestacks，eliminated toxic substances from manufacturing processes，即：发电厂烟排放已经减少，制造过程中的有毒物质也被除去，故选D。
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