求助93.10.25

tibetboy

25. The Hopi community of Oraibi in northeastern Arizona is one of the oldest, not if the oldest, continuously occupied settlements north of Mexico.

最后一个选项of前后应该是n,而且settlement也是n,，两个名词不能放在一起，也就是说settrlement和north不能放在一起，那么这里应该如何解释呢？

consonant

=settlements which is north of Mexico在Mexico 以外的北边

the north of Mexico是内部北部