小学生可以从3年级开始学习《新概念英语》。

《新概念英语》开始就是实用日常对话，没有更基础的准备过程(例如字母、较简单的句子等)，所以需要一定英语基础才能学习。3年级的学生已经在学校学了两年英语，对英语已经不陌生，而且心智和学习能力也具备了，就可以开始学习《新概念英语》了。

There are still many problems of environmental protection in recent years. One of the most serious problems is the serious pollution of air, water and soil. the polluted air does great harm to people’s health. The polluted water causes diseases and death. What is more, vegetation had been greatly reduced with the rapid growth of modern cities. To protect the environment, governments of many countries have done a lot. Legislative steps have been introduced to control air pollution, to protect the forest and sea resources and to stop any environmental pollution. Therefore, governments are playing the most important role in the environmental protection today. In my opinion, to protect environment, the government must take even more concrete measures. First, it should let people fully realize the importance of environmental protection through education. Second, much more efforts should be made to put the population planning policy into practice, because more people means more people means more pollution. Finally, those who destroy the environment intentionally should be severely punished. We should let them know that destroying environment means destroying mankind themselves.

目前环保还存在着许多问题。最严重的问题就是空气、水和土壤的严重污染。污染的空气对人类的健康十分有害。污染的水引起疼病，造成死亡。更有甚者，随着现代社会的迅速扩建，植被大大的减少。 为了保护环境，各国政府做了大量的工作。采用了立法措施控制大气污染，保护森林资源和海洋资源，制止任何环境污染。因此，在当今的环保中政府起着最重要的作用。 我的看法是，为了保护环境，政府应当采取更具体的措施。首先，应当通过教育的方法使人们充分謒到环境保护的重要性。第二，应更加努力把计划生育政策付诸实施，因为人口多就意味着污染严重。最后，要严惩那些故意破坏环境者。使他们破坏环境就是毁灭人类自己。

练好英语听力，可通过以下方法：

①听力与阅读是相通的，必须有大量且牢固的英语词汇量基础;

②告别哑巴式英语，在背单词、读课文的时候一定要读出声音来。同时，注意发音要标准;

③拒绝中式英译法，增加自己的英文句子储备，养成英语思维。