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1、In the early in industrialized countries of Europe the process of industria lization-with all the farreaching changes in social patterns that followed-was spread over nearly a centur y,whereas nowadays a developing nation may unde rgo the same process in a decade or so

2、The American economic system is organized around a basically privateenter p rise,marketoriented economy in which consumers largely determine what shall be produced by spending their money in the marketplace for those goods and services that they want most

3、Pollution is caused either by man′s release of completely new and often ar ti ficial substances into the environment,or by releasing greatly increased amounts of a natural substance,such as oil from oil tankers into the sea.

4、The kinds of evidence for the roundness of the world that led finally to it s general acceptance included such data as the shape of the shadow of the earth on the moon during an eclipse of the moon,the fact that as one sails from port on a ship the building of the port gradually seem to sink below the surface of the water,and,most convincing,the fact that it is possible to sail all around the wo rld and return to the starting point of the voyage .

5、Apart from the enormous outflow of funds from the oilconsuming countries, a more basic concern is the capability of the major exporters of crude oil to ac hieve a continuing production target roughly doubling output every ten years to meet the required oil demand if present trend continues.

6、Pollution and waste combine to be a problem everyone can help to solve by c ut ting out unnessary buying,excess consumption and careless disposal of the produc ts we use in our daily lives.