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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相关考题
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单项选择题
Ethanol and methanol have important advantages（）other carbon-based alternative fuels.
A.on
B.over
C.by
D.with -
单项选择题
On the other hand, alternative fuels do have（）.
A.drawbacks
B.setback
C.drawer
D.backward -
单项选择题
There is a growing realization that the only（）way to achieve further reductions in vehicle emissions is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.
A.effective
B.efficient
C.sufficient
D.Supplement
