简述量变和质变的关系。
正确答案及解析
正确答案
解析
（1）量变是质变的必要准备。任何事物的变化都有一个量变的积累过程，没有量变的积累，质变就不会发生。（2）质变是量变的必然结果。单纯的量变不会永远持续下去，量变达到一定程度必然引起质变。
（3）量变和质变是相互渗透的。一方面，在总的量变过程中有阶段性和局部性的部分质变；另一方面，在质变过程中也有旧质在量上的收缩和新质在量上的扩张。量变和质变是相互依存、相互贯通的，量变引起质变，在新质的基础上，事物又开始新的量变，如此交替循环，构成了事物的发展过程。量变质变规律体现了事物发展的渐进性和飞跃性的统一。
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Heahh care experts have long drawn attention to the problems of eating too much sah．There isstrong evidence that a diet high in salt can lead to raised blood pressure．Since high blood pressure is amajor factor in heart disease．it makes sense to cut down on the salt people eat．?
In the past，food contained very little salt，and people added it to their food at the table．Very fewpeople ?add ?salt this ?way ?nowadays．However，the ?salt ?content ?of processed ?foods has ?gone ?updramatically．It’s now estimated that over three．quarters of the salt in the average diet comes fromprocessed foods，eaten without our being aware of it．?
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Salt is added to food partly to extend shelf-life．but more often it’s dropped in to make up for theflavor lost in the manufacturing process．This is especially true of ready meals and highly processedfoods．but it’s also true of such basic food as biscuits，soups，and even bread．Much mass—producedbread，for instance．contains so much salt．half a gram for every hundred grams of bread--that it’sofficiallv classified bv the UK government as high——salt food．Salt has to be added to the bread becausefast Droduetion cuts down the time for the flavor to develop．Without added salt，the bread would tastelike paper．?
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