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1、Words Review,Unit 4,Read the explanation and speak out the word it explains.,2.sudden and powerful;using force to hurt or attack,violent,adj.猛烈的；激烈的；强暴的,harmful,adj.有害的,atom,n.原子,exist,vi.存在；生存,1.causing harm,3.the smallest unit of any chemical element,globe,n.地球；地球仪；球体,4.to be,or to be real;to live
2、,or to live in difficult conditions,5.the world;a map of the world in the shape of a ball,which is fixed to a support and can be turned round at the same angle as the Earth turns in space;any ball-shaped object,theory,n.学说；理论,multiply,vi.&vt.乘；增加,6.a formal statement of the rules on which a subject
3、of study is based or of ideas which are suggested to explain a fact or event,7.to increase very much in number,or(in mathematics)to add a number to itself a particular number of times,pron.&n.&adj.万亿；十亿,billion,8.the number 1,000,000,000,9.with this result,adv.因此；于是,thus,oxygen,n.氧,10.a colourless g
4、as that forms a large part of the air on Earth and which is needed by people,animals and plants to live,11.the mixture of gases around the Earth;a feeling that a place has of being pleasant and interesting or exciting,atmosphere,n.大气层;气氛,unlike,prep.不同；不像,fundamental,adj.基本的；基础的,12.different from,13
5、.forming the base,from which everything else develops,14.(a length of)rings usually made of metal which are connected together and used for fastening,pulling,supporting,or limiting freedom,or as jewellery;a set of connected or related things,15.any of various usually liquid substances which can react chemically with and sometimes dissolve other materials,chain,n.链子；连锁；锁链,acid,n.酸,carbon dioxide,二氧化碳,16.the gas formed when carbon is burned,or when people or animals breathe out,
