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
The author would most probably regard the criticism of methanol as ______.
A．inaccurate because it ignores consumer's concerns
B．misguided because of its exclusively technological focus
C．flawed because of the assumption on which it is based
D．invalid because it reflects the personal bias of the critics
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
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