单选题_____APartBMuchCSomeDAll
单选题
_____
A
Part
B
Much
C
Some
D
All
参考解析
解析：
由前文提及的“new problem”是“smog from cars（汽车尾气）”可知，此处的“problem”是导致产生汽车尾气的原因之一，并非全部，因此排除绝对选项all，又因problem是单数可数名词，不能被much及some修饰，所以唯一符合文意的选项是part，故选A。
由前文提及的“new problem”是“smog from cars（汽车尾气）”可知，此处的“problem”是导致产生汽车尾气的原因之一，并非全部，因此排除绝对选项all，又因problem是单数可数名词，不能被much及some修饰，所以唯一符合文意的选项是part，故选A。
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