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
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相关考题
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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 -
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
