单项选择题 A.writen B. sulfered C.observed D.lost

单项选择题 What can we infer from the underlineed sentence in Paragraph 3?A.People are fra less familiar with the world of fantasy.B.The world around us could serve as a sound of wonder.C.The world of fantasy can be mirred by a small and lively pond.D.Modern technology prevents us from developing our sense of wonder.

多项选择题 项目可行性研究阶段投资估算应采用（）方法估算。