单项选择题
A.general B.generation C.generate D.generous
Ethanol is commonly used as a gasoline supplement, but ...
单项选择题Ethanol is commonly used as a gasoline supplement, but it is currently about（）methanol.
A.twice as expensive as B.twice as more expensive as C.as twice more expensive as D.as twice expensive as
At a rough estimate,Nigeria is（）Great Britain.A.three t...
单项选择题At a rough estimate,Nigeria is（）Great Britain.
A.three times as big as B.three times as bigger as C.as three times big as D.as three times gigger as
There is a serious liability（）performance and fuel effi...
单项选择题There is a serious liability（）performance and fuel efficiency.
A.in time of B.in case of C.in terms of D.in honour of
