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单项选择题

On the other hand, alternative fuels do have（）.

A.drawbacks
B.setback
C.drawer
D.backward

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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

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

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