单项选择题
There is a growing realization that the only（）way to achieve further reductions in vehicle emissions is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.
A.effective
B.efficient
C.sufficient
D.Supplement
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相关考题
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单项选择题
These reactions increase the probability of incomplete combustion and are more likely to（）uncombusted and photochemically active hydrocarbon compounds into the atmosphere.
A.lease
B.release
C.please
D.relief -
单项选择题
There is a growing realization that the only effective way to achieve further reductions in vehicle（）is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.
A.permission
B.emission
C.omission
D.Mission -
单项选择题
Consequently, more than 100 cities in the United States still have levels of carbon monoxide, particulate matter, and ozone that（）legally established limits.
A.succeed
B.proceed
C.exceed
D.excess
