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【单选题】
废气再循环装置主要用于减少废气中什么的含量( )A.
HC
B.
CO
C.
HC 、CO、NO X
D.
NOx
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举一反三
【单选题】. They did everything they could to prevent the pollution ______ the river.
A.
protecting
B.
to protect
C.
from being protected
D.
from protecting
【单选题】If more short journeys were made by bicycles, energy could be saved and pollution ______.
A.
declined
B.
reduced
C.
dropped
D.
decreased
【简答题】主人公( )是骑自行车时被( )撞死的。
【单选题】It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.
A.
how
B.
whether
C.
that
D.
where
【简答题】主人公 ( ) 是骑 自行车时被 ( ) 撞死的。
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