Today the quality of our natural environment has become an important issue. The world population is rising so quickly that the world has become too crowded. We are using up our natural resources and at the same time polluting our environment with dangerous chemicals. If we continue to do this, life on earth cannot survive. Concerned people have made some progress in environmental protection. Governments of many countries have established laws to protect the air, forests and sea resources and to stop environmental pollution. Still more measures should be taken to solve environmental problems. People should be further educated to recognize the importance of the problems, to use modern methods of birth control, to conserve our natural resources and recycle our products. We are sure that we can have a better and cleaner place in the future.
GMAT数学例题详解(二十)
GMAT数学备考资料:练习+讲解(12)
GMAT数学备考资料:练习+讲解(8)
GMAT数学备考资料:练习+讲解(16)
GMAT数学真题140道(2)
GMAT数学例题详解(十九)
GMAT数学数据填充题应试技巧
GMAT数学术语:代数部分的基本运算词汇
GMAT数学备考资料:练习+讲解(15)
GMAT数学关于"整除"的一些技巧
GMAT数学词汇整理:几何三角
GMAT数学例题详解(十三)
GMAT数学真题140道(3)
GMAT数学备考资料:练习+讲解(3)
GMAT数学备考资料:练习+讲解(1)
GMAT数学备考资料:练习+讲解(9)
GMAT数学必背词汇汇总(2)
GMAT数学例题详解(十一)
GMAT数学例题详解(八)
GMAT数学词汇整理:几何平面立体
GMAT数学例题详解(十六)
GMAT数学考察点详细介绍
GMAT数学例题详解(十)
GMAT数学备考资料:练习+讲解(14)
GMAT数学术语:代数部分的方程,集合,数列词汇
GMAT数学例题详解(二十一)
GMAT数学术语:几何部分的三角词汇
GMAT数学例题详解(四)
GMAT数学备考资料:练习+讲解(13)
GMAT数学必背词汇汇总(1)
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