结构推理 The company estimates its annual revenue per average customer at about $2,000 as compared to $860 in the United States. That's partly due to the fact that ______________________________ (拉丁美洲电话客户的通话时间是北美洲客户的二至四倍).

【正确答案】Latin American customers talk two to four times as long on the phone as people in North America.

【答案解析】[译文] 该公司预计，他们从每位拉美电话客户身上获取的平均年收益约为2000美元，而从每位美国客户身上获取的年平均收益则为860美元，其中部分原因是：拉丁美洲客户的通话时间是北美洲客户的2～4倍。