英語第十一周测试题目.docVIP

英语： Plants and animals, including humans, need food and water to live on. These are from the natural resources(资源) on Earth. To protect these resources, we need to keep the air clean and the water drinkable. We need to keep the soil (土壤)healthy. How do we do that? Protect the land The soil that covers fields and farms provides much of the food we eat. Human activities such as plowing(耕) fields, mining(采矿), and building highways can destroy (破坏)the land. Erosion happen when wind and water carry away the soil. Soil erosion can turn rich farmland into a desert wasteland. So does this mean we shouldn’t build a highway or plow a field? Of course not. But it does mean we might think about Earth梖riendly ways of doing those things. Today farmers plow their fields in different ways to prevent erosion. They try to use less water for their crops. They keep animals from eating the growing grass in just one area. Farmers also plant trees to prevent erosion from happening. Save the Trees Another human activity that damages the land is deforestation(采伐森林). People take away a large number of trees from a forest. Millions of square kilometers of forest disappear each year. When this happens, many plants and animals lose their places to live. They may die out, or become very few. Scientists haven’t even discovered all the living things in the forest. We may be losing some without even knowing they are there. Trees absorb (吸收)and use carbon dioxide (二氧化碳)when they make food. Environmentalists encourage careful management of the forests. They ask people to replant trees after they cut down the forest. Recycle, Reuse, Reduce People throw a piece of paper into the wastebasket after using it. The paper becomes trash. Where does the trash go next? Much of our trash ends up in landfills(垃圾填埋地). They take up valuable land and sometimes pollute the water, air, and land around them. More than a third of the trash in landfills is paper. Recycling, reusing, and reducing what you throw away