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  3. The author of the passage is primarily concerned with______. According to the passage, incomplete combustion is more likely to

The author of the passage is primarily concerned with______. According to the passage, incomplete combustion is more likely to

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问题 The author of the passage is primarily concerned with______.
According to the passage, incomplete combustion is more likely to occur with gasoline than with an alternative fuel because______.
选项 A、the combustion of gasoline releases photo-chemically active hydrocarbons
B、the combustion of gasoline involves an intricate series of reactions
C、gasoline molecules have a simple molecular structure
D、gasoline is composed of small molecules
答案B
解析 细节题。题意为："根据本文，汽油比其他燃料更可能燃烧不充分，因为______"。第二段谈到汽油的分子大于其他燃料的分子，而大分子的燃烧涉及更复杂的系列反应增加了不完全燃烧的可能性。所以答案选项正确。
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考研英语一

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