单项选择题
A.arising B.rise C.raise D.arouse
However, since methanol-fueled vehicles could be design...
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
Methanol’s most attractive feature is that it can reduc...
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
It is currently about（）as methanol.A.twice as expensive...
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
