...San Antonio is changing plastic bags into sleeping mats...
根据第一段“A group of young people in San Antonio is changing plastic bags into sleeping mats (睡垫) for the city’s homeless people.(圣安东尼奥的一群年轻人正在把塑料袋变成该市无家可归者的睡垫)”可知,青少年回馈SATX的主要目标是帮助无家可归的人。故选B。 (2)题详解: 主旨大意题。根据...