[外语类试卷]大学英语四级模拟试卷790(无答案).doc
《[外语类试卷]大学英语四级模拟试卷790(无答案).doc》由会员分享,可在线阅读,更多相关《[外语类试卷]大学英语四级模拟试卷790(无答案).doc(26页珍藏版)》请在麦多课文档分享上搜索。
1、大学英语四级模拟试卷 790(无答案)一、Part I Writing (30 minutes)1 Shopping on the Internet1现在流行网上购物2网上购物有利有弊3你的看法二、Part II Reading Comprehension (Skimming and Scanning) (15 minutes)Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions attached to the passage. For
2、 questions 1-7, mark:Y (for YES) if the statement agrees with the information given in the passage;N (for NO) if the statement contradicts the information given in the passage;NG (for NOT GIVEN) if the information is not given in the passage.1 LandfillsYou have just finished your meal at a fast food
3、 restaurant and you throw your uneaten food, food wrappers, drink cups, utensils and napkins into the trash can. You dont think about that waste again. On trash pickup day in your neighborhood, you push your can out to the curb, and workers dump the contents into a big truck and haul it away. You do
4、nt have to think about that waste again, either. But maybe you have wondered, as you watch the trash truck pull away, just where that garbage ends up.Americans generate trash at an astonishing rate of four pounds per day per person; which translates to 600,000 tons per day or 210 million tons per ye
5、ar! This is almost twice as much trash per person as most other major countries. What happens to this trash? Some gets recycled (回收利用) or recovered and some is burned, but the majority is buried in landfills.How Much Trash Is Generated?Of the 210 million tons of trash, or solid waste, generated in t
6、he United States annually, about 56 million tons, or 27 percent, is either recycled (glass, paper products, plastic, metals) or composted (做成堆肥) (yard waste). The remaining trash, which is mostly unredeemable, is discarded.How Is Trash Disposed Of?The trash production in the United States has almost
7、 tripled since 1960. This trash is handled in various ways. About 27 percent of the trash is recycled or composted, 16 percent is burned and 57 percent is buried in landfills. The amount of trash buried in landfills has doubled since 1960. The United States ranks somewhere in the middle of the major
8、 countries (United Kingdom, Canada, Germany, France and Japan) in landfill disposal. The United Kingdom ranks highest, burying about 90 percent of its solid waste in landfills.There Are Two Ways to Bury Trash:Dump-an open hole in the ground where trash is buried and that is full of various animals (
9、rats, mice, birds). (This is most peoples idea of a landfill!)Landfill-carefully designed structure built into or on top of the ground in which trash is isolated from the surrounding environment (groundwater, air, rain). This isolation is accomplished with a bottom liner and daily covering of soil.S
10、anitary landfill-landfill that uses a clay liner to isolate the trash from the environment.Municipal solid waste (MSW) landfill-landfill that uses a synthetic (plastic) liner to isolate the trash from the environment.The purpose of a landfill is to bury the trash in such a way that it will be isolat
11、ed from groundwater, will be kept dry and will not be in contact with air. Under these conditions, trash will not decompose(腐烂)much. A landfill is not like a compost pile, where the purpose is to bury trash in such a way that it will decompose quickly. Proposing the LandfillFor a landfill to be buil
12、t, the operators have to make sure that they follow certain steps. In most parts of the world, there are regulations that govern where a landfill can be placed and how it can operate. The whole process begins with someone proposing the landfill.In the United States, taking care of trash and building
13、 landfills are local governments responsibilities. Before a city or other authority can build a landfill, an environmental impact study, must be done on the proposed site to determine:the area of land necessary for the landfillthe composition of the underlying soil and bedrockthe flow of surface wat
14、er over the sitethe impact of the proposed landfill on the local environment and wildlifethe historical value of the proposed siteBuilding the LandfillOnce the environmental impact study is complete, the permits are granted and the funds have been raised, then construction begins. First, access road
15、s to the landfill site must be built if they do not already exist. There roads will be used by construction equipment, sanitation (环卫) services and the general public. After roads have been built, digging can begin. In the North Wake Country Landfill, the landfill began 10 feet below the road surfac
16、e.What Happens to Trash in a Landfill?Trash put in a landfill will stay there for a very long time. Inside a landfill, there is little oxygen and little moisture. Under these conditions, trash does not break down very rapidly. In fact, when old landfills have been dug up or sampled, 40 years old new
17、spapers have been found with easily readable print. Landfills are not designed to break down trash, merely to bury it. When a landfill closes, the site, especially the groundwater, must be monitored and maintained for up to 30 years! How Is a Landfill Operated?A landfill, such as the North Wake Coun
18、ty Landfill, must be open and available every day.Customers are typically municipalities and construction companies, although residents may also use the landfill.Near the entrance of the landfill is a recycling centre where residents can drop off recyclable materials (aluminum cans, glass bottles, n
19、ewspapers and paper products). This helps to reduce the amount of materials in the landfill. Some of these materials are banned from landfills by law because they can be recycled.As customers enter the site, their trucks are weighed at the scale house. Customers are charged tipping fees for using th
20、e site. The tipping fees vary from $10 to $ 40 per ton. These fees are used to pay for operation costs. The North Wake County Landfill has an operating budget of approximately $ 4. S million, and part of that comes from tipping fees.Along the site, there are drop-off stations for materials that are
21、not wanted or legally banned by the landfill. A multi-material drop-off station is used for tires, motor oil, and lead acid batteries. Some of these materials can be recycled.In addition, there is a household hazardous waste drop-off station for chemicals (paints, pesticides, other chemicals) that a
22、re banned from the landfill. These chemicals are disposed of by private companies. Some paints can be recycled and some organic chemicals can be burned in furnaces or power plants.Other structures alongside the landfill are the borrowed area that supplies the soil for the landfill, the runoff collec
23、tion pond and methane (甲烷) station.Landfills are complicated structures that, when properly designed and managed, serve an important purpose. In the future, new technologies called bioreactors will be used to speed the breakdown of trash in landfills and produce more methane.2 The passage gives a ge
24、neral description of the structure and use of a landfill.(A)Y(B) N(C) NG3 Most of the trash that Americans generate ends up in landfills.(A)Y(B) N(C) NG4 Compared with other major industrialized countries, America buries a much higher percentage of its solid waste in landfills.(A)Y(B) N(C) NG5 Landf
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
2000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 外语类 试卷 大学 英语四 模拟 790 答案 DOC
