【听力原文】
Artist Tiesheng Dai is one of the few Chinese residents remaining in the U．S．capital ’s Chinatown．He used to have two art galleries．But rent hikes forced him to close both of them．A sign outside the building is the only evidence they existed．
The area ’s housing costs have been pushed up over the years by other ethnic groups flooding in．The Chinese population has shrunk from a high of 3，000 to around 300 today．[23]Chinatown began to develop decades ago．as new immigrants moved there because most of them faced language and cultural barriers in other neighborhoods．
Tom Fong，vice chairman of the local chapter of the Chinese Consolidated Benevolent Association，says things gradually changed． “As quickly as the kids they bring over assimilate the English language，the parents actually lean on them. We don't actually need a Chinatown English speaking translator or liaison to help get us there." Most of the current Chinese residents have low incomes and receive government subsidies. Many live in Museum Square, one of Chinatown's two affordable apartment houses. [24] But the government subsidy for this complex expires in October, and the owner plans to replace the building with modern high.rise apartments.So the residents are being forced to move out.
Dai, the artist, has lived here for almost nine years. He says the remaining residents don't want to move. "Some families with three generations are living together. Some of them have been here longer than me, for more thaon ten years. Some  for 20 some years."
If affordable housing is no longer available, the residents may not be able to stay in the Chinatown area, according to Derek Hyra, the director of American University's Metropolitan Policy Center. Hyra says without Chinese residents, the local government cannot promote Chinatown as an authentic ethnic tourist attraction. "I think that cities that are more racially tolerant and ethnically and racially diverse tend to be the places that have the most innovation. There is association between diversity and economic development."
[25] And Tom Fong says, when it comes to retaining Chinese culture, Chinatown matters. "My hope isthat my kids and their kids will still have that touchstone of Chinatown to be a part of and come down here to perform lion dance, and to do Kong Fu and spread our culture, to retain our culture for generations to come."
Why have many new immigrants moved to Chinatown over the past decades?
【解题思路】四项均以they开头，且都是一般过去时的描述性句子。本题考查的内容应该是关于主语they的相关情况，听录音时将重点放在四项的关键信息上(housing costs，languageand cultural barriers，Chinese culture，government subsidy)。
【解析】讲话前面部分提到，几十年前多数新移民因在其他居住区会遇到语言及文化障碍而涌入唐人街。由此可知，选项B是正确答案。