A、C、D都从不同侧面说明Glorietta旅馆的服务情况。B选项则概括了他们共性的东西，即：为什么旅客在这家旅馆里有宾至如归的感觉。因此选B。如果文章中包含以上信息，B选项就是中心句。

　　3.  选择最佳中心思想

　　Sugar history in the Hawaiian Islands is filled with pioneering. In sailing ship days, Hawaiian sugar growers were many months from sources of supplies and from markets. This isolation built up among the Hawaiian growers an enduring spirit of cooperation. Growers shared with one another improvements in production. Without government aid of any sort, they built great irrigation projects. Without government help, they set up their own research and experiment organization. Pioneering together over the years, they have provided Hawaii with its largest industry。

　　A. In sailing days, Hawaiian sugar growers were many months away from supplies and markets。

　　B. Hawaiian sugar growers built their great industry without government help。

　　C. Hawaiian sugar growers have set up their own research organization and have shared improvements。

　　D. By pioneering together, sugar growers have provided Hawaii with its largest industry。

　　A、B、C只是说明了夏威夷糖业的某一方面，是文章中的具体内容。只有D概括说明了夏威夷糖业振兴发展的秘诀，是全文要说明的问题。因此选D。