[解析]
(1)B.细节理解题,were so grateful that Gregory decided to focus his efforts on helping house the homeless population in his city可知他打算致力于给这个城市无家可归的人做房子.即帮助无家可归的人.故选B
(2)D.细节理解题,根据文中句子And soon his"Homeless Homes Project"was started,可知是 Homes Project这个组织机构.故选D
(3)A.推理判断题,根据句子 doors become house doors;washing machine doors…to move their homes around easily可知他把冰箱门改造成了房门,洗衣机门改成了窗户,车顶改成了房顶,把轮子安到了房子的下面以供移动,这是很有创造力和想象力的.故选A
(4)C.推理判断题,根据句子lot of people who hear about what I'm doing want to get involved可知当他出版了那本书的后更多的人都想参与到他的计划里来,由此可推知更多无家可归的人将会受益于此.故选C