题型:名词解释 Believe it or not, he spends _____ of his money helping those who are in need of help.A. two-threesB. two-three C. two-third D. two-thirds 查看答案
题型:名词解释 环境卫生学主要研究()A.自然环境与人体健康的关系B.生活环境与人体健康的关系C.自然环境和社会环境与人体健康的关系D.自然环境和生活居住环境与人体健康的关系E.社会环境和生活环境与人体健康的关系 查看答案