精选优质文档-倾情为你奉上Unit 1Man has a blood tie with nature and nobody can live outside nature. Nature provides us with everything we need: the air we breathe, the water we drink, and the food we eat. For quite a long time after man began to live in the r_ (1) of nature, he lived in fear of its destructive forces. He used to regard nature with its e_(2) forces as something hostile to him. And even the forest was something wild and frightening to him. Very often, he was unabl
