Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight. (A) ozone is formed in the atmosphere from (B) ozone is formed in the atmosphere when (C) ozone is formed in the atmosphere, and when (D) ozone, formed in the atmosphere when (E) ozone, formed in the atmosphere from 这题大家在看不懂专业单词的情况下如何利用考点去寻找选项?感激! |