梗概写作与六选四新题型.docx

Ex. 1(A)In North America, the Colorado River is a legend. It has sustained generations of people and many generations of wildlife. Once free, the Colorado now has many dams along its 1,450 miles. Its life-giving water is divided up among seven U.S. states according to several agreements, which has caused the heaviest hit on the eco-balance of the river as no region would lose advantages compared with neighbors in the use of the river, thus inappropriate use was well expected.The Colorado once supported a vast delta（三角洲）where it met the Gulf of California. Today the lush plantations are just memories, displaced by invasive species capable of surviving in soils poisoned by salt. The drying of the delta has huge effect on the local people. As many as 5,000 people were living in the delta 400 years ago. Today, about 300 remain. There is a delta culture at risk of extinction, partly owing to outside job opportunities and marital mobility. However, the worsening living environment caused partly by horrible grab of the waters of the Colorado River has beaten all the other reasons.It’s easy to blame farmers along the Colorado for drawing waters from its channel to water their crops or quench the thirst of their cows. They are immediate consumers of water from the Colorado, but the truth is that we, ordinary American consumers, are all at least partially responsible. Many of us have bought products that come from the region, whether in the form of paper, hamburgers, or electronics. In the U.S., we use twice as much water per person as the global average.Though it may seem to work in the short term, we can barely fix the Colorado by piping water from another place. But change is urgent. Use a water calculator to see how much water you use every day. Pay special attention to saving every drop of water hidden in your diet and wardrobe. And keep away from life styles that might waste water. In all, try to form a water-efficient habit. Besides, technology improvement will als