2018年5月19日雅思写作真题预测二
【摘要】 即将参加雅思考试的考生们，考试即将到来，你们的备考工作进行得如何了？考必过为大家精心整理了2018年5月19日雅思写作真题预测二，希望能够帮助大家通过雅思考试。那么，同学们一起快来做题吧！关于2018年5月19日雅思写作真题预测二的具体内容如下：
对于很多准备考雅思的同学来说，不知道准备得怎么样呢？今天就和考必过的小编一起来了解一下2018年5月19日雅思写作真题预测二。
参考题目2
Eating sweet foods produces acid in the mouth， which can cause tooth decay. （High acid levels are measured by low pH values） Descr...
Eating sweet foods produces acid in the mouth， which can cause tooth decay. （High acid levels are measured by low pH values） Describe the information below and discuss the implications for dental health. You should write at least 150 words. Allow yourself 20 minutes for this task.
解题思路
【首段】总述过多的糖会伤害牙齿，因为糖会使得pH值下降 【二段】甜食让pH值下降到5.5以下，时间越长越容易蛀牙 【三段】分述蔗糖最易引起蛀牙 【四段】分述果糖和蜂蜜对pH值的影响 【尾段】总述果糖和蜂蜜要比蔗糖好
范文
Anyone who has visited a dentist has been told that eating excessive amounts of sweets risks harming the teeth. This is because sweets lower pH levels in the mouth to dangerous levels. When the pH level in the mouth is kept above 5.5， acidity is such that teeth are unlikely to be in danger of decay. Sweet foods， however， cause pH in the mouth to drop for a time， and the longer pH levels remain below 5.5， the greater the opportunity for decay to occur. By comparing fruit sugar， cane sugar and honey， which are all common ingredients of sweet foods， we find that cane sugar lowers pH levels for the longest period， thus producing the greatest risk of the three. Approximately five minutes after consuming cane sugar， pH levels drop to as little as pH 3.5. They then begin to rise slowly， but do not rise above pH 5.5 until at least 30 minutes have elapsed. By contrast， fruit sugar， which causes the mouth＇s acidity to fall to just above pH 4， poses a danger for a shorter period： tooth decay is unlikely 20 minutes after consumption. Honey appears an even less risky substance. Though acidity falls to about pH 4.75 within five minutes of consumption， it returns to above pH 5.5 in under fifteen minutes. The implications， then， are that people who insist on eating sweet foods should be aware of the ingredients， and that fruit sugar or honey appear preferable to cane sugar.
以上就是考必过为大家整理的2018年5月19日雅思写作真题预测二的具体内容，你全部做对了吗？所谓未来，其实只是过去的堆砌，堆砌昨天便有了今天，堆砌今天便有了明天，堆砌明天便是未来。最后，考必过预祝大家在未来的雅思考试中能够取得优异的成绩！