前面一个空用a是因为a most serious的意思是很严重.这个并不是最高级.a most表示“很,非常”
后一个空只是单纯的说需要采取措施,不需要有“特指”的意思.是泛指的方法.这样说,measires前面可以加some啊什么修饰词,并没有指明是什么方法.所以不需要用定冠词the.
我也是一个学生 .如果还是看不懂我可以再解释,如果实在看不懂……咳咳 、能力有限,问老师是最佳途径……
Air pollution is___most serious problem in many major cities
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