2014英语四级考试快速阅读练习（1）_大学英语阅读

2014英语四级考试快速阅读练习（1）

　　built if they do not already exist. There roads will be used by construction equipment, sanitation 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 surface.

　　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-year-old newspapers 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 County 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 center where residents can drop off recyclable materials . This helps to reduce the amount of material 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 the 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 $4.5 million, and part of that comes from tipping fees.