In the upper Midwest especially in Wisconsin, Minnesota, and Noah Dakota, a surprising percentage of the population claims to be of Norwegian _____.

【正确答案】 A、C
【答案解析】

根据句意可知,填入的词汇要表达“挪威后裔”这一意思,故应选AC两项。C项extraction意为血统,引申为后裔。