Cloze Complete the following passage with words chosen from this unit. The initial letter of each is given. 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 r_________(1)(领域) of nature, he lived in fear of its destructive forces. He used to regard nature with its e___________ (2)(自然力的)forces as something hostile to him. And even the forest was something wild and frightening to him. Very often,he was unable to o_________(3)(获得) the merest daily necessities though he worked together with others s_______(4) (顽强地)and collectively with his imperfect tools. Through his interaction with nature, man changed it gradually. He cut down forest, cultivated land, t_______(5)(转移)various species of plants and animals to different climatic conditions, changed the shape and climate of his environment and t _______(6) (改变)plants and animals. He s_______ (7) (征服)and disciplined electricity and compelled it to serve the interests of society. Nonetheless, with the constant e_______(8)(扩张) of agriculture and industry, man has robbed nature of too much of its i_______(9)(不可替代的)resources, polluted his own living environment and caused about 95% of the species that have existed over the past 600 million years to become e_______(10)(灭绝的) and still many others to be endangered. The previous d________(11)(动态的) balance between man and nature is on the v_______(12)(边缘) of breaking down. Man is now faced with the problem of how to stop, or at least to m______(13) (节制) the destructive effect of technology on nature. The crisis of the e________ (14)(生态的) situation has become a global problem. The solution to the problem depends on r________(15)(理性的,合理的) and wise organization both of production itself and care for Mother Nature. This can only be done by all humanity, rather than by individuals, enterprises or separate countries.