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.
单项选择题 Ethanol and methanol have important advantages（）other carbon-based alternative fuels.
单项选择题 On the other hand, alternative fuels do have（）.
