题目解析:
counterparts: 作名词,意为对等物,相对物。B 选项意为对等物,等量物,是考核词的近义词。Though the leading Mediterranean states were small in size, they were considerably wealthier than their northern counterparts.对应原文中呈现出了比较的逻辑,而比较的对象为 leading Mediterranean states 和 northern counterparts,结合上下文和这里的比较关系,就可以猜测 counterparts 的意思。A 选项 associates 意为合伙人,伴侣;C 选项意为对手;D 选项意为崇拜者。只有 B 选项的 equivalents 代入,才可以使这个句子最为连贯,语境也说得通。C 选项有一定迷惑性,代入也连贯。但是 B 选项和 coutnerparts 的意思最为接近。因此答案为 B 选项。