Today, pollution has become a serious problem to us. It means that the air, seas, rivers and land are polluted by waste or poisonous things. It does harm not only to human beings but also to animals (It does harm to animals, as well as human beings.)。
We cannot have fresh air because many factories have the poisonous smoke sent into the air. Beautiful parks are made dirty by plastic tins and bags. Fish die from the polluted water. It is said that strange diseases have appeared in some places because of pollution.
I hope scientists can find ways to solve the serious problem. We are looking forward to seeing the clear sky, clean rivers and beautiful parks again.
GMAT数学中的极端思维介绍
GMAT数学考试内容和出题方式是什么样的
GMAT数学基础差应该如何复习
GMAT数学满分需要具备哪8步
好的GMAT数学备考习惯如何养成
GMAT数学五大实用做题方法介绍
GMAT数学如何有效提速
GMAT数学标准房差公式计算讲解
GMAT数学复习计划介绍
GMAT数学基本概念汇总小结
GMAT数学机经使用窍门简介
如何打好GMAT数学基础
GMAT数学考试如何获得满分
GMAT数学应该从哪几个方面打好基础
GMAT数学高分需掌握逆向思维
GMAT数学中有哪些常见的逻辑误区
GMAT数学实战技巧分享
GMAT数学概率题目考点解题思路分析
怎样培养合理的GMAT数学思维
GMAT数学满分需要经历哪些必要步骤
GMAT数学有哪些知识点和误区
GMAT数学经典习题举例分析
GMAT数学复习遇到挫折怎么办
GMAT数学哪些知识点常被遗忘
调整心态迎接GMAT数学难题
GMAT数学失分原因之马虎
GMAT数学常用的五大解题法则
GMAT数学有哪些经典题目解法
GMAT数学做题速度如何提高
GMAT数学排列组合技巧介绍
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