单项选择题

The author is primarily concerned with ______.

A．countering a flawed argument that dismisses a possible solution to a problem
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
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单项选择题
According to the passage, incomplete combustion is more likely to occur with gasoline because ______.
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 fewer carbon-carbon bonds
D．gasoline is a carbon-based fuel with smaller molecules
单项选择题
It can be inferred from the passage that a vehicle specifically designed to use methanol, for fuel would ______.
A．be somewhat lighter in total body weight than a conventional vehicle fueled with gasoline
B．have a larger and more powerful engine than a conventional vehicle fueled with gasoline
C．average more miles per gallon than a "gasoline alone" vehicle fueled With methanol
D．have a larger and heavier fuel tank than a "gasoline alone" vehicle fueled with methanol
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