Ⅲ.综合运用

Turn Food Waste into Green Energy

Americans waste a lot of food—about 60 billion kilograms a year—one-third of all the food produced in the U.S.This not only wastes money and resources,but also d__1__the environment.Food waste is often sent to landfills.Then it releases greenhouse gas,a main c__2__of global warming.

Scientists have been looking for s__3__to the food waste problem.Now researchers at Cornell University in Ithaca，New York（纽约伊萨卡岛），think they've found a possible way.They say that by two simple chemical processes，we could turn food waste into green e__4__.

The point is to“turn food waste into a valuable resource”,said Roy Posmanik,a researcher at Cornell University.

First,food waste is heated u__5__high pressure to create oil that can be made into fuel.Then,the waste will be broken down into biogas.This gas can be u__6__to produce electricity and heat,according to the researchers.

In the future,food waste from homes,supermarkets and restaurants may be sent not to landfills b__7__to treatment plants.

1.d____________2.c____________3.s____________4.e____________5.u____________6.u____________7.b____________