According to the report，animals used in experiments are commonly subjected to force feeding and the infliction of burns and wounds to study the healing process.最后的不定式，是人去研究，但是却没有出现人这个主语，这个句子是不是错的？
In the south part of China, many people even go to work by boat. Because water is around their _______(house).这里的 house 必须是用复数吗？我觉的单数也可以，表示他们各自的房子。另外，句子里的 work 是动词词性吗？
...里为什么加that of，感觉去掉也没有关系。还有in microcosm的in怎么理解，对应不到词典的释义。
①In many aspects, Mahan's story is that of the Asian community in microcosm.
从许多方面来说，马汉的经历就是亚裔团体的经历的缩影。
②The body i...