在英语里面,一句话只能包含一个谓语动词.现在假设把and去掉,那么there is a lot ……里面有个is谓语；而it is serious中也有个谓语动词is,所以不能去掉.连词and在这里面起的是连接的作用.
逗号后的and为什么要加?In the poor parts of America's big cities there
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