3. However, some kinds of

　　1) Survival of fittest: some animals do have their lethal shortages and would decline even without humans, saving those species which are biological elimination is against the nature and of no help.

　　2) When we save a kind of animal, we may do harm to another kind. Thus the proper way is that human should try their best to keep the balance of nature as it is rather than change the nature as humans purpose. Human and Nature should perform their own functions respectively.

　　3) Instead of saving, the restrictions on human ourselves are more important: pollution, environmental destroy, catching and killing excessively.

　　4) The extinction of species is the warning of the deterioration of the environment which would early or late threaten human beings.

　　Conclusion:

　　No matter from the position of practical utilization or morality, human both should ... However, it should be noticed that... Therefore, we should find out the real reason of dying out. Furthermore, we should pay more a...to

　　以上便是关于社会与自然的GRE Issue作文重点题目了，各位考生可以选择其中的一些语句来进行总结背诵，做到熟练掌握这个话题，祝大家考试顺利!

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