单项选择题
However, since methanol-fueled vehicles could be designed to be much more（）than gasoline clone vehicles fueled with methanol, they would need comparatively less fuel.
A.effective
B.efficient
C.sufficient
D.supplement
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单项选择题
Methanol’s most attractive feature is that it can reduce（）about 90 percent the vehicle emissions.
A.of
B.in
C.on
D.by -
单项选择题
It is currently about（）as methanol.
A.twice as expensive as
B.as twice expensive as
C.as expensive twice as
D.expensive as twice as -
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Ethanol and methanol have important advantages（）other carbon-based alternative fuels.
A.on
B.over
C.by
D.with
