怎样保持健康的英语作文40字【一】
苹果为什么削皮后放有一定的时间会变成褐色呢？我在书本和网络中寻找答案，得知个中原因是苹果里含有一种氧化酶，当苹果削去皮后，果肉与空气相遇，在氧化酶的催化下果肉中的氧化物质便被氧化，导致变色。
怎么样才使削皮后的苹果不变色呢？为此，我做了几个实验。
首先，把苹果果肉切成薄片，在其中的一片上滴上几滴柠檬汁，第二片涂上盐水，第三片什么都不涂。
大约10分钟过去后，第三片开始变浅咖啡色，其他两片还保持原来的鲜亮洁白。半个小时后，第三片果肉从咖啡色变成了黄褐色，其他两片仍然保持原来的颜色不变。
实验表明了柠檬水和盐水可以让去皮后的'苹果不变色。为什么柠檬汁和盐水有这个功效呢？原来柠檬汁里含有维生素C，维生素C有还原性；盐水能把空气挡在外面，果肉接触不到空气，自然不会变色了。
不管是用柠檬汁还是盐水，其原理都是阻止去皮苹果接触空气而被氧化变色，这就是保持苹果不变色的绝招！按照这样的原理，要使苹果去皮后不变色，就要想方设法阻止果肉接触空气。
为了进一步印证这个原理，我又做了第二次实验，去三片果肉片，一份暴露在空气中，一份泡在凉开水中，一份涂上橙汁，结果第一片还是在约10分钟后变色，第二份约30分钟后开始变颜色，第三片过了24小时还是没有变色。可见涂上橙汁可以防止去皮的苹果变色，原来橙汁跟柠檬汁一样含有维生素C，也能阻止苹果果肉的氧化。
因此，要想使苹果去皮后不变色，我们可以采取多种方法，只要是能够阻止空气与苹果果肉接触，都能达到目的。
怎样保持健康的英语作文40字【二】
Smoking is a bad habit that does harm to smoker and others. Many kinds of diseases and cancers are caused by smoking, such as tracheitis, lung cancer and many other diseases. Recent years, there are tens of thousands of people dying of smoking. But there still are many people enjoying smoking, because they think smoking is a kind of fashion and smoking is so cool, especially among teenagers. In addition, smoking does harm to others as well. Second hand smoking has been recognized harmful to other people. Even worse, it may cause more damages. Therefore, people should remember that smoking is harmful to others and those people who smokes should give up smoking as soon as possible.
吸烟是个坏习惯，它对吸烟者和别人都有害。很多疾病和癌症是有吸烟引起的，比如说气管炎，肺癌还有很多其他疾病。近年来，成千上万的人死于吸烟。但是仍然有很多人喜欢吸烟，因为他们认为吸烟是一种时尚，很酷，特别是青少年。另外，吸烟也会对别人有害。二手烟是公认的对别人有害的。更糟糕的是，它会带来更多伤害。因此，人们应该牢记吸烟有害他人，那些吸烟的人应该尽可能戒烟。
怎样保持健康的英语作文40字【三】
Today smoking is a widespread habit ali over the world. Not only the old, the youth, but also middle school students have been engaged in smoking. Many of them think that smoking is a smart symbol.
However, smoking is harmful to one's health. It contributes a lot of lung cancer, from which many people have died in the past years. It can also cause many other diseases. In a word, if you smoke, you do have a much greater chance of losing your health. Furthermore, scientific research shows that smoking is not only harmful to smokers themselves, but also a threat to public health, especially to women and children. Therefore, many countries have made laws forbidding smokers to smoke m public places such as cinemas, stations, hospitals, and so on Giveup smoking! If you don't smoke, don't start. Give upsmoking for the sake of your health, for the sake of your family, and for the sake of the whole world.
当今吸烟是一个世界范围内的习惯。不仅是老人，青年，而且中学生都吸烟。他们中的许多人认为吸烟是一种潇洒的象征。
然而，吸烟有害人的健康。它会引起肺癌，其中许多人在过去的一年都死去了。它还可以造成许多其他疾病。总之，如果你吸烟，你有更大的机会失去你的健康。此外，科学研究显示，吸烟不仅对吸烟者有害，而且对公众健康构成威胁，尤其是对妇女和儿童。因此，许多国家都制定了法律禁止吸烟如电影院，车站，医院等公共场所禁止吸烟，如果你不抽烟，不要开始。戒烟吧，为了你的健康，为了你的家庭，和世界。
怎样保持健康的英语作文40字【四】
I attended Jack's birthday party tonight. After dinner, Jack gave cigarets to our boy students present.
At the important moment, I stop them and told them the bad effects of smoking: firstly Smoking is a waste of money and it's greatly harmful to our health. And it can lead to fires easily. So we should not smoke at all.
But it seemed helpless and they wouldn't listen to me. Somebody even said that body and health belonged to themselves and it's up to them to decide whether to smoke or not. I told him calmly, "Even if you have the right to harm your own body, but it doesn't mean that you have the same right to harm others'."
At last, they agreed with me, and some students said that they would never smoke any longer.
For the next one hour, we danced and sang happily, and nobody did smoke again.I felt very happy that my classmate all understood the harmness of smoking.
我今晚参加了杰克的生日派对。晚饭后，杰克给我们的男同学吸烟。
在重要的时刻，我阻止并告诉他们吸烟的不良影响：首先，吸烟很浪费钱，它对对我们的健康危害很大。它会很容易引起火灾。所以我们不应该吸烟，所以我们不能吸烟。
但很无奈似乎他们不听我的。甚至有人说身体是自己的，这是是否吸烟由他们自己说了算。我平静地说，“即使你有伤害自己身体的权利，但这并不意味着你要伤害别人的权利。”
最后，他们同意我的看法，一些学生说他们不会再抽烟了。
在接下来的一个小时里，我们跳舞，唱歌，没有人吸烟了。我感到非常高兴，我的同学都知道了吸烟的危害。
怎样保持健康的英语作文40字【五】
我们埋着头，或学习，或工作，那近在咫尺的美却悄然溜远了。而当我们退一步时，当我们与美保持适宜的距离时，便会领略到不一样的美！
什么？你问：“距离为何产生美呢？”我想，大概是由于近距离可以让人宏观地把握事物，而远距离能带来未知的神秘，引发了人们的美好幻想吧！
在美国登月之前，中国早已流传着嫦娥奔月等关于月亮的美丽的传说。然而，当宇航员们带回来几块冰冷的石头时，当宇航员们发回几张月球真实“面貌”的照片时，那些美丽的`传说便荡然无存了。从此，每当人们说起月亮，脑海中只会浮现出一个荒凉的星球，而人们不再会想象月球上会有嫦娥、玉兔与广寒宫了。
远观月亮，能使人们产生了美好的遐想；近观月球，人们知道的却只有荒凉的星球。这便是距离的奇妙作用！ 那么，在我们的生活中，又如何去退出来去被忽略的美呢？ 美，此刻的距离便是人与人之间的距离！在这个物欲横流的社会里，人们的心灵总被功名利禄紧紧裹住，以至于无法体会到身边的美，所以，我们要与功名利禄有着适宜的距离：当我们不再是为家长、老师的夸奖和奖励而学习时，我们会发现，书本中的知识是如此有趣；当我们放慢上学的脚步时，我们会发现，街边的苍翠的大树多么富有活力；当我们不再那么冷漠地对待生活时，我们会发现，世界是多么的温暖……生活中处处皆有美，人们缺乏的只是保持与美有着适宜的距离而已。
当我们的心灵得到解放时，当我们与万物保持着适宜的距离时，我们会发现天空，是能给了我们翱翔的天空；我们会发现大地，是能养育万物的大地；我们会发现海洋，是孕育了最初的生命的海洋…… 让我们一起退一步，保持与美有着适宜的距离，那么，身边的美就会纷纷呈现出来的！
怎样保持健康的英语作文40字【六】
下面谈谈学习毅力的.问题。如果你有坚强的毅力，那么世界上就没有什么难事。学英语关键是能够持之以恒。
在学习过程中，你应该制订一个计划，一天记住几个单词，一天记住一两个句型。你不要小看“持之以恒”的力量。举个例子：
如果你一天背5个单词一年就是1825个单词，相当于初中三年再加高中一年零两个月的词汇量。如果你坚持两年你就能住3650个单词，相当于中学六年包括本科两年的词汇量。
在制订计划时要遵循以下几项原则:
1、计划要切实可行，不要好高务远。上面的例子已经说明，只要你能坚持天天学习，英语一定能学好。
2、要有坚强的毅力，每天都学习，不因为某些事而耽误了学习。如果哪天的工作没有完成，第二天一定要补上。连续不学习的时间不要超过两天。
3、要有一个帐本，哪天学会了哪几个单词，哪几个句型一定记录在案。
4、为了把单词、句型真正学到手，第二天一定要复习第一天的，第三天一定要复习第二天和第一天的内容。
5、所选择的课本可以是一套或两套，千万别太多。实际学英语的书没有什么好坏之分，只要你能按照一套或两
怎样保持健康的英语作文40字【七】
the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
