单项选择题
A.正确.可以提高学生的学习成绩B.正确,给予学生充分的学习时间C.错误,忽视了学生的独立性D.错误,忽视了学生的完整性
A.Careless methods of production.B.Lack of consumer demand for environment friendly products.C.Millions of tons of glass,paper,plastic and metal containers are produced.D.Both A and B