药物滥用的危害英语小作文【一】
Recently, the topic of air pollution has again aroused more and more attention since pollution haze, a kind of weather, has appeared increasing frequently in our cities. Just as the picture showed, when pollution haze comes, the whole city was covered with suspended particles which can breath into our body causing heavy problem to our health.
Due to the bad effect from pollution haze, a green and clear environment, rather than anything else, turns to be an important role and a urgent issue in our daily lives. Meanwhile we just live in only an earth, if we didn’t try to protect our common hometown, we would have no place to settle.
Thus, we should take effective measures to rebuild our beautiful environment of the cities from now on.
In my opinion, law and regulations should be enforced by the government and authorities to control the emission of polluting gas. To ourselves, we should enhance the awareness of environment protection and choose a green lifestyle to make contribution to our earth day from day.
药物滥用的危害英语小作文【二】
为了提高学生学习的积极性,需要创造机会更好地与学生沟通,真正了解学生具体情况,才能有的放矢对自己的教学作出改变。如在课堂上有意识地改变上课节奏或插上一段与所讲内容相关的典故,让课堂气氛生动活泼而不是气沉沉;在课间加强交流,回答学生在课堂上还未理解的疑难问题;在课外以调查问卷的形式了解学生对自己教学方式的看法,根据情况作出适当的改变。通过这种师生互动,可以真正了解学生的具体情况,尽可能地把本专业的精髓传授给学生,使学生终生受益。学生对教师的学识和教学方法认可之后会促进他们对该课程的兴趣和关注,这种和谐的师生关系也可以反之促进教学。培养学生的学习兴趣和启发学生参与教学活动的主动性是提高教学质量的重要途径。通过上述一系列的教学方法和教学手段的应用,大大激发了学生的学习兴趣,活跃了课堂气氛,有效调动了学生的积极性和主动性,培养了学生提出问题和解决问题的能力,提高了学生的综合素质,教学质量也有了明显提高。
药物滥用的危害英语小作文【三】
在课堂教学中开场白虽时间不长,但十分重要。特别是在每一章的绪论部分,开场白尤为重要。好的开场白能够将学生的兴趣吸引到教师所讲授的内容上,激发学生求知欲、调动学生学习的积极性。例如讲授黄酮类化合物这一章时,先问同学们知道花儿为什么这样红吗?学生出于好奇心急于知道答案并由此产生兴趣,从而带着疑问积极参与教学过程,接着讲述黄酮类化合物的结构分类、理化性质等。又如,在讲到黄酮类化合物理化性质中溶解性这一节时,问同学们苷类化合物一般是溶于水的,而作为黄酮苷的芦丁却难溶于水,这是为什么?启发同学们要解释这一现象就必须剖析芦丁的结构。原来芦丁这个黄酮醇苷却因苷元分子的平面性而难溶于水,从而得到答案,强化记忆。再如,三萜类化合物的结构相对比较复杂,难于记忆。启发同学们从简单的结构开始学起,一个苯环为苯,两个苯环为萘,三个苯环为菲,将菲完全氢化则成为多氢菲,多氢菲再接上环戊烷是环戊烷骈多氢菲,此结构即为三萜类化合物共有的一个甾体母核结构,在此母核的17位碳上连接一个含有8个碳原子的侧链,再接上几个不同的角甲基即成为不同类型的三萜。为什么把三萜叫做四环三萜呢?因为三萜含有三个苯环和一个环戊烷共四个环,所以叫做四环三萜。这样一步步的启发式讲解比一下子给出三萜的结构要容易理解与掌握。因此,教师在教学中有目的、有方向地进行引导,有意创设问题情境是促使学生开动脑筋的一把金钥匙。在教学中通过设置疑问进行启发式教学,能够调动学生学习的积极性、主动性、创造性,取得良好教学效果。
药物滥用的危害英语小作文【四】
The components that make up haze may have negative effect on people's health especially that of the children and the elderly. Also not excluded are those who have certain diseases such as asthma, allergy, and pneumonia and lung disease. Workers working in the open air have a high risk in their health.
组件构成烟雾可能对人们的健康有负面影响特别是儿童和老人。也不排除是某些疾病如哮喘、过敏、肺炎和肺部疾病。工人工作在露天有很高的.风险在他们的健康。
