中石油职称英语阅读练习（含答案）
　　下面这篇中石油职称英语阅读文章是关于使用清洁燃料替代汽车现
用燃料的，后面有这篇文章的练习题，读完后大家可以做一下，看大家
对文章的信息掌握了多少。
　　Carbon-based
Alternative
　　1.Althoughrecent
yearshave
seensubstantial
reductions
innoxious
pollutantsfromindividual
motor
vehicles,
thenumber
ofsuch
vehicles
hasbeen
steadily
increasing.
(完成时进行式
)Consequently,
more
than
100citiesin
theUnited
Statesstill
havelevels
ofcarbonmonoxide,
particulate
matter,
andozone(generated
byphotochemical
reactions
with
hydrocarbons
fromvehicle
exhaust)that
exceed
lega ...