求解一道逻辑题Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters,devices designed to reduce nitrogen dioxide emissions,have been required in all new cars in Donia since 1993,and as a result,nitrogen dioxide emissions h

求解一道逻辑题Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters,devices designed to reduce nitrogen dioxide emissions,have been required in all new cars in Donia since 1993,and as a result,nitrogen dioxide emissions h
求解一道逻辑题
Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters,devices designed to reduce nitrogen dioxide emissions,have been required in all new cars in Donia since 1993,and as a result,nitrogen dioxide emissions have been significantly reduced throughout most of the country.Yet although the proportion of new cars in Donia’s capital city has always been comparatively high,nitrogen dioxide emissions there have showed only an insignificant decline since 1993.
Which of the following,if true,most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia’s capital city?
A.More of the cars in Donia’s capital city were made before 1993 than after 1993.
B.The number of new cars sold per year in Donia has declined slightly since 1993.
C.Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993
D.Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
E.Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.
我觉得这里没有答案,但官方给的答案是E,我认为E说的是catalytic converter是否能够有效的工作,原文没说他的工作有效性啊,

求解一道逻辑题Nitrogen dioxide is a pollutant emitted by automobiles.Catalytic converters,devices designed to reduce nitrogen dioxide emissions,have been required in all new cars in Donia since 1993,and as a result,nitrogen dioxide emissions h
Explain型逻辑题,要给一个矛盾的现象给出原因或者解释,这种题有两个步骤第一,找到矛盾点,第二,针对矛盾点给出解释.
首先,原文的矛盾点在Catalytic converters能
reduce nitrogen dioxide emissions,而且这个Catalytic converters是要求安装在新车的,可是Donia’s capital city 的新车比例是高的但是为什么nitrogen dioxide 排放量的减少却是不明显,
其次,针对这个矛盾点给出解释,新车多,那就是Catalytic converters也多,那Catalytic converters多却减少不了nitrogen dioxide 的排放,那多而无用,多而无效,这是可以解释的一方面,原文说Catalytic converters可以减少nitrogen dioxide ,我们不是要反对这个事实,我们只是要看看这个事实的发生是不是需要条件的,如果需要条件才能让这个事实成立,那自然可以解释矛盾,如E选项.