1/2或1/3
(1/2) Nowadays, people always throw the old things away when they buy new things; whereas in the past, old things were repaired and used again.What factors cause this phenomenon? What effects the phenomenon leads to?
(1/3) Many species of plants and animals are dying out.What are the causes of this trend? How can we prevent it?
以上就是关于雅思写作话题的出题方式的总结，包括了对两种方式的详细介绍。大家可以在备考自己的雅思写作考试的时候，针对自己的备考情况和上面所列的类型进行更加有针对性的练习。
