2. 外语
  3. Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by

Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by

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问题 Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
选项 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
答案B
解析 首先排除D、E。D代入原句，导致原句句子结构不完整，formed过去分词短语修饰ozone，而react作为when从句的谓语，使得主句仅有主语ozone，无谓语动词；E中，ozone作主语，formed短语作ozone的修饰语，react作主句谓语动词。这样表达有两个缺陷：(1)ozone与react连接属于主谓不一致；(2)改变了句意。接着排除A、C。在A中：react不知是何成分。C中由于and的出现导致when从句找不到并列对象。B对，when从句是修饰谓语动词form的时间状语。
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