The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes【C1】___

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问题     The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes【C1】________zero in January,【C2】________and March. But the northeastern and north central regions of the country 【C3】________financial and industrial centers for a long time, and they are heavily polluted.
    In recent years, people in these regions have begun to take vacations【C4】________these cold winter months. They go to the southern parts of the country【C5】________it is warmer. Many go to Florida where the climate is【C6】________. Others go to the southwestern states like Arizona, New Mexico and Texas where they【C7】________a dry desert climate.
    It has become【C8】________nowadays for old people to move south to these places【C9】________they retire. Typically these people sell their houses in their original communities and move south to begin a new life【C10】________senior citizens.
    Their children probably have homes【C11】________and many of them are moving south【C12】________communities where they were【C13】________.The southern and southwestern parts of the country are now growing【C14】________any other part.
    Business and industry have【C15】________many offices and factories in the south. California is already the most popular state in the country.
【C9】

选项 A、when
B、where
C、unless
D、though

答案A

解析 分析句子结构可知,空处引导的是一个状语从句,再结合句意可知,应用连接副词when(当……时,在……之后)引导时间状语从句。where:(在)……的地方,引导地点状语从句;unless:除非,如果不,引导条件状语从句;though:尽管,引导让步状语从句。故选A。
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