Man 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 1 _____ of nature, he lived in fear of its destructive forces. He used to regard nature with its 2 _____ forces as something hostile to him. And even the forest was something wild and frightening to him. Very often, he was unable to 3 _____the merest daily necessities though he worked together with others 4 _______ and collectively with his imperfect tools. Through his interaction with nature, man changed it gradually. He cut down forest, cultivate land, 5______ various species of plants and animals to different climatic conditions, changed the shape and climate of his environment and 6 ______ plants and animals. He 7______ and disciplined electricity and compelled it to serve the interests of society. Nonetheless, with the constant 8_____ of agriculture and industry, man has robbed nature of too much of its 9________ resources, polluted his own living environment and caused about 95% of the species that have existed over the past 60 million years to become 10 ______ and still many others to be endangered. The previous 11________ balance between man and nature is on the 12 _______ of breaking down. Man is now faced with the problem of how to stop, or at least to 13 ________ the destructive effect of technology on nature. The crisis of the 14 _______ situation has become a global problem. The solution to the problem depends on 15 ______ and wise organisation both of production itself and care of Mother Nature. This can only be done by all humanity, rather than by individuals, enterprises or separate countires. 备选词: elemental stubbornly rational dynamic moderate obtain realm transferred subdued transformed expansion ecological verge extinct irreplaceable