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
单项选择题 Methanol’s most attractive feature is that it can reduce（）about 90 percent the vehicle emissions.
单项选择题 It is currently about（）as methanol.
单项选择题 Ethanol and methanol have important advantages（）other carbon-based alternative fuels.
