[B] reconciling contradictory points of view about the nature of a problem.

　　[C] identifying the strengths of possible solutions to a problem.

　　[D] discussing a problem and arguing in favor of one solution to it.

　　2. According to the text, incomplete combustion is more likely to occur with gasoline than with an alternative fuel because

　　[A] the combustion of gasoline releases photochemically active hydrocarbons.

　　[B] the combustion of gasoline embraces an intricate set of reactions.

　　[C] gasoline molecules have a simple molecular structure.

　　[D] gasoline is composed of small molecules.

　　3. The text suggests which of the following about air pollution?

　　[A] Further attempts to reduce emissions from gasoline-fueled vehicles will not help lower urban air-pollution levels.

　　[B] Attempts to reduce the pollutants that an individual gasoline-fueled vehicle emits have been largely unsuccessful.

　　[C] Few serious attempts have been made to reduce the amount of pollutants emitted by gasoline-fueled vehicles.

　　[D] Pollutants emitted by gasoline-fueled vehicles are not the most critical source of urban air pollution.

　　4. Which of the following most closely parallels the situation described in the first sentence of the text?

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