3月19日听力练习 The modern world,
:qq66][color=#ff0000] listen to the material carefully,although it is difficult and sometime you can't write down the correct answer.As long as you have tried,whatever you write down will be the harvest of yours.You should believe that only by accumulating little by little could you learn English welll.so come on.[/color]The modern world, however, has found more important uses for its diamonds than the making of jewellery. They have been put to work; __________________________. It can cut or polish the hardest steel or grind its way through solid rock.Only a diamond is hard enough to cut another diamond, and it is not the big stones which are needed for the drills, saws and grinding wheels. _________________________________.
Yet it is a strange fact that nature makes its hardest mineral from exactly the same substance as one of its softest. This soft mineral is graphite, which is very easily broken up and is used to make the “lead” in your pencil. The name “lead” should not really be used, _______________________—just the same as a diamond.
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[audio]http://down02.putclub.com/newupdate/mnjjt/liuji/201103/putclub.com_6.6cet60319.mp3[/audio] re 1 for diamond, there are hardest XXXX to find in areas.
2 Only factory
3 because graphite consist nothing but carbon 1.for the diamond its hard symbol found in ?
2.only factories that demond the diamond does which the early miners deposite uses
3.because graphite consists nothing but black carbon.
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