The northern parts of the United States get very cold in the win

The northern parts of the United States get very cold in the winter.It snows a great deal and the?temperature often goes_____21_____zero degree in January,_____22_____and March.But the northeastern and?northcentral regions of____23______have been financial and industrial centers,and they are heavily polluted. In recent years,people in these regions have begun to take vacations_____24_____these cold winter?months.They go to southern parts of the country____25______it is warmer.Many go to Florida where the?weather is_____26_____.Others go to the southwestern states of Arizona,New Mexico and Texas where they._____27_____dry desert climates. It has become_____28_____nowadays.for old people to move south to these places_____29_____they?retire.Typically these people sell their houses in their home communities and move south to begin a?new life_____30_____senior citizens. Their children likely have homes_____31_____and many of them are moving south_____32_____communities?where they were_____33_____.The southern and southwestern parts of the country are now growing_____34_____any?other part.Business and industry_____35_____many offices and factories in the south.California is already?the most popular state in the country. 第（30）题答案
A、for
B、as
C、to
D、toward
【正确答案】：B
【题目解析】：for 表示目的或原因；as 表示“作为”；to 表示方向或目的；toward 表示朝向。根据句意，这些人搬到南方开始一种新生活，作为老年人。因此，选项 B 是正确的答案。