参考答案B解析:该段由四个句子组成，其中两个句子中都出现了“showroom／(商品样品的)陈列室”，由此推测showroom可能是该段主题词。关注段落中涉及到showroom的句子“Thus response to the first showroom was overwhelming：people loved being able to see and try the furniture before buying it．”该句说“首间宜家展厅的反响强烈，因为人们十分乐意在购买之前能亲眼看到并试用这些家具”。该句内容与选项B(引入展厅所带来的成功)意义一致，由此判断选项B是该段主题。
A．Ingvar Kamprad—a born businessman B．Success brought by the introduction of showrooms C．The origin of IKEA D．Specialization in selling furniture E．Flat packaging—a feature of IKEA F．World—wide expansion of IKEA