2. 考研
  3. The author is primarily concerned with ______. According to the passage, incomplete combustion is more likely to occur with gas

The author is primarily concerned with ______. According to the passage, incomplete combustion is more likely to occur with gas

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问题 The author is primarily concerned with ______.
According to the passage, incomplete combustion is more likely to occur with gasoline because______.
选项 A、the combustion of gasoline releases photochemically active hydrocarbons
B、the combustion of gasoline involves an intricate series of reactions
C、gasoline molecules have fewer carbon-carbon bonds
D、gasoline is a carbon-based fuel with smaller molecules
答案B
解析 这是一道细节题。根据第二段3、4两句可知答案选项是汽油燃烧不完全的原因，故为答案。"the combustion of gasoline releases photochemically active hydrocarbons"是汽油燃烧不完全可能带来的结果，不能回答本题。
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考研英语一

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