In the United States continues to welcome a large number of immigrants each year and has referred to as a melting-pot society. This trend can reflect the theory of ______.
 
【正确答案】 C
【答案解析】 根据句意，现在每年仍旧有许多移民进入美国，因此美国被称为一个大熔炉，这反映的是全球化现象。故选C。macroculture“宏观文化”；microculture“微观文化”；modernization“现代化”。