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必背的雅思写作段落

　　Scientists are doing experiments on live animals for the purpose of research nowadays .Some people believe that this is not only cruel but also unnecessary; others think it is in the interest of mankind as a whole . Discuss

　　The first reason can be seen by every person is that results of experiments on some certain animals can help scientists. Scientists can determine whether these sorts of substance which are used in laboratory are feasible or not by analyzing the reaction of the animals. Sometimes, it is not only the best way but also the only approach due to danger of the experiments that could not occur on the human being.

　　The second reason for my propensity for the above statement is that the scientists can keep researching with different ways. It is flexible and economical for experts to do it, even though they fail to attain what they want. Furthermore, they may repeat process more easily.

　　However, on the other hand, we can not deny that some people want to reach their achievements by killing the animals cruelly. So something has to be done to improve the technology and equipments in laboratory, meanwhile, to make sure these behaviors are legal.

　　Many people argue that in order to improve educational quality continuously, students are encouraged to make comments or even criticism on teachers. Others think the respect and discipline in the classroom will disappear. Which opinion do you prefer?