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我是来自加拿大的雅思外教Mac。今天，和你分享一个雅思小作文题目的原创范文。范文详解点这里。
题目：
The line graph shows the length of time, measured in minutes, it takes for acid levels produced by three types of sugar, namely fruit, cane, and honey, to drop and PH levels to rise in the mouth so as not being likely to cause tooth decay.
Overall, it takes the mouth the longest after eating cane sugar for PH levels to return to normal and for acidity to drop; whereas, for honey, it takes the least amount of time.
Acidity levels in the mouth produced by all three categories of sugar after being consumed, increase dramatically, with PH levels decreasing proportionally, dropping to 3.5 at the five-minute mark for cane sugar, which in turn produces the most amount of acidity. Fruit sugar drops to 4.3 at this point and honey drops the least, coming in at a PH level of 4.8.
From the five-minute point to the 10-minute mark, PH levels in the mouth caused by honey remain fairly stable; however, for both fruit sugar and cane sugar, PH levels begin increasing immediately after bottoming out at the five-minute point.
In general, tooth decay becomes unlikely 12 minutes after ingesting honey, 18 minutes for fruit sugar, and 33 minutes for cane sugar, yet acidity and PH levels do not return to normal until after a further ten to twelve minutes after this threshold is crossed.
该折线图展示了口腔在摄入三种糖分 — 即果糖、蔗糖和蜂蜜 — 后，其酸度下降、pH 值回升至不再易于引发蛀牙所需的时间（以分钟为单位）。
总体而言，口腔在摄入蔗糖后，需要最长的时间才能使 pH 值恢复正常、酸度下降；而摄入蜂蜜后所需的时间最短。
所有这三类糖分在被摄入后，口腔的酸度都会急剧升高，pH 值则成比例下降。在五分钟时，蔗糖的 pH 值降至 3.5，产生的酸度最高。此时果糖的 pH 值降至 4.3，而蜂蜜的下降幅度最小，pH 值为 4.8。
从五分钟到十分钟，蜂蜜引起的口腔 pH 值基本保持稳定；然而，对于果糖和蔗糖来说，它们的 pH 值在五分钟时触底后便立即开始回升。
一般来说，摄入蜂蜜后 12 分钟，蛀牙的可能性就变得很低了（意为 “变得不易蛀牙”）；果糖需要 18 分钟；蔗糖则需要 33 分钟。然而，酸度和 pH 值要在越过这个临界点（指 “不易蛀牙” 的节点）后，再经过十到十二分钟，才能恢复正常。
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