四级暑期天天练：写作必备范文(5)
发表时间：2010年2月27日10:46 来源：中大网校
点击关注微信：
Environmental Protection
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.
（责任编辑：）
