【正文】 potential extinction of those species is the result of human activities. 1) There are some species extinctions are attributed to human activities. We have deteriorated their natural habitat, disturbed the food chain and caused global warming. 2) Undeniably is that there are extinctions which are not results of human activities. According to Darwin’s Natural Selection Theory, it is normal to have animals extinct. 3) We save the endanger species not because we are the cause of their extinction, but by acplishing such action, we are able to maintain the diversity of nature, which in turn benefit human ourselves. students should base their choice of a field of study on the availability of jobs in that field. See 20 we acquire more knowledge, things do not bee more prehensible, but more plex and mysterious. 1) By acquiring more knowledge, the accumulation casts light upon numbers of problems. Physics enable us to master construction and biology makes vaccine or even an transplantation possible. 2) While being able to solve more problems, it is indisputable that we e up with more questions asking for answers. Where is the edge, if exist, of the universe? Where is worm hole? Can we travel through time? Is superluminal possible? 3) Things are plicated as their innate characters. What accumulating knowledge enabled us is not making things more elusive and imperable, but to equip us with the ability to find more questions that we seldom notice before. any situation, progress requires discussion among people who have contrasting point of view. 1) People share the same view will work efficiently with each other, and the group will be harmonious. Clubs summons people with the same interest and same ambition to be together, so they will work towards the same target like families. 2) Different voices are valuable in groups. Because they are more likely to be creative and innovative, and such characteristics are increasingly valuable in modern society. 3) However on the other hand, being too stubborn to cooperate always impede the development and far from being conducive. So on learn to tolerate the different view and cooperate for the maximum benefit. institutions should dissuade students from pursuing fields of study in which they are unlikely to succeed. See 3 should not fund any scientific research whose consequences are unclear. 1) Few researches can be anticipated before being carried out, and whether the consequences are clear or not is not a favorable standard. 2) Even the consequences are unclear or negative, researches still worth funding for, because the valuable experience will benefit the ing generation and direct later researches. Noble’s research about safer explosive. 3) Though some researches may bear clear and accessible fruit, funding for them categorically is still open to doubt. Cloneantihuman, nuclear weapondevastating. should identify those children who have special talents and provide training for them at an early age to develop their talents. 1) Undeniable is that special training will make it easier for children with talents to succeed. It is a waste to leave those talents dormant forever. 2) Distinguishing talented children from ordinary children may be a discriminating action. This action will have negative impact on both the talented and ordinary. The talented are more likely to be pompous and never take pains to do something, while the ordinary just feel abandoned. 3) There are much more than talent to be taken into consideration than talent, such as moral sense, social skill, and correct values. is primarily through our identification with social groups that we define ourselves. 1) It is our intrinsic nature to be part of a group in which we share the same trait with others. Boys like to hang out with boys and keep away with girls since primary school, and people love to join the interest clubs and fraternities. 2) People share within the same social group help each other and stimulate each other to bee better. Top students in high schools like to form study groups in which they have the approximate academic performance, and in these groups, students are inspired by each other to work hard. 3) As we grow up and accumulate more experience, we are more likely to be distinguished by characteristics other than interests and gender, which divide us into different social groups. We are more likely to be selfindependent and define ourselves by the occupation, family background, and personality. students should be encouraged to pursue subjects that interest them rather than the courses that seem most likely to lead to jobs. See 20 : When planning courses, educators should take into account the interests and suggestions of their students. Reason: Students are more motivated to learn when they are interested in what they are studying. 1) Students are less likely to voluntarily sign up for difficult courses if not required to. However, these courses may be important. Physics, math and puter programming. 2) Students’ interests do count when arranging the curriculum. Motivation is indeed a significant role in stimulating a student to be persistent and fanatic. Bill Gates is crazy for puter programming and that devotion for numbers and structures in turn helped him build Microsoft. 3) Being too extreme about either of the options, absolute interestbased or absolute experiencedbased, is not a desirable choice. Educators should arrange some pulsory courses together with some selective courses which satiate the students’ interests. 4) Such suggestion helps professors to improve their teaching skills and being up to date. Subsequently, the overall benefits or university and students will be satiated. greatness of individuals can be decided only by those who live