《新视野大学英语 New Horizon College English》课程教学资源（PPT课件讲稿）Unit 6 How to Prepare for Earthquakes

Text Analysis: Main Idea and Devices for Developing It New words Main idea of the Main idea of each & text and devices part and devices Text for developing it for developing it Transcript

团购合买资源类别：文库，文档格式：PPT，文档页数：52，文件大小：28.61MB

Back How to Prepare for Earthquakes Ideally, people would like to know when an earthquake is going to happen and how bad it will be. In both Japan and China, people have long believed that earthquakes can be forecast. In Japan, scientists have wired the Earth and sea to detect movements. The Chinese have traditionally watched animals and plants for warning signs of earthquakes. For example, the Chinese have noted that before an earthquake, hens’ behavior changes — they refuse to enter their cages at night. They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot, even normally quiet dogs. Before the Hanshin earthquake in Japan, there were reports of large schools of fish swimming near the surface of the water. Certain birds, like pigeons, also seemed to be especially noisy, and were reported to be flying in unusual patterns before the earthquake. Perhaps most interesting, and most easily measured, is a chemical change in ground water before a quake. Experimental data seem to indicate that the amount of radon (Rn) in the water under the surface of the Earth waxes before an earthquake. People would also like to be able to prevent the great destruction of property caused by earthquakes. After all, most of the people who die in earthquakes are killed by falling buildings. Therefore, building structures that can withstand the power of earthquakes is a major concern. Steel seems to be the best material, but not if it is welded to form a rigid structure. Many new structures are built with a new type of steel joint, an I-joint, which appears to be the most durable type of joint. These joints of steel can move without breaking. Also, to prevent property damage, architects now design buildings so that the building’s columns and horizontal beams are of equal strength, and vertical support columns are inserted deep into solid soil. In addition, many new houses have relatively light roofs and strong walls. Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel. Besides working to improve building structures, people in areas where earthquakes are common need to prepare for the possibility of a great earthquake. They should regularly check and reinforce their homes, place heavy objects in low positions, attach cupboards and cabinets to walls, and fasten doors so that they will not open accidentally during an earthquake. In addition to preparing their houses, people in these regions need to prepare themselves. They should have supplies of water and food at home and at work. It is best to store several gallons of water per person. It is also important to have something that can clean water and kill bacteria, so water from other sources can be made safe to drink. Store one week’s food for each person. Earthquake survival supplies include a radio receiver, a torch, extra batteries, first-aid supplies, a spade, a tent, some rope, and warm clothing. Experts also suggest the following: Keep a fire extinguisher handy. You should have one at home, at work, and in your car (if you have one). The fire extinguisher should be able to put out any type of fire. Have the proper tools to turn off gas and water lines if necessary. Arrange an auxiliary cooking and heating source that can be used outside. One alternative is a portable camp stove with small cans of gas. Keep a pair of heavy, comfortable shoes or boots in your home, at work, and in your vehicle. If there is an earthquake, there will be lots of fragments of broken glass. Light shoes will not protect your feet as well as heavy shoes will. Every family needs to have earthquake emergency plans. How will family members leave the area during the chaos following an earthquake? Everyone should agree on a meeting point outside of the area — perhaps in a town several miles away. Also important is an arrangement for family members to communicate if there is an earthquake. If an earthquake happens in a large city, many of the telephone lines within the city are likely to be down. The few remaining working lines will be busy with the calls that naturally occur after a disaster and it will be difficult to call from one part of the city to another. It might, however, be possible to call outside the city. A sensible arrangement is to have all of the members of the family call to check in with a friend or relative who lives more than a hundred miles away. Although scientists still cannot predict earthquakes, they are learning a great deal about how the large plates in the earth’s crust move, the stresses between plates, how earthquakes work, and the general probability that a given place will have an earthquake. Someday soon it may actually become possible to predict earthquakes with accuracy. However, even if prediction becomes possible, people who live in areas where earthquakes are a common occurrence will still have to do their best to prevent disasters by building structures that are resistant to ground movement and by being personally prepared. These precautions can make a great difference in saving lives and preventing the loss of homes. Education concerning how to survive an earthquake should be a major emphasis for all government programs and earthquakerelated research projects

点击进入文档下载页（PPT格式）

共52页，可试读18页，点击继续阅读 ↓↓

点击下载（PPT格式）

浏览记录