袁翠萍

Energy saving vehicles were part of the Green Transportation Festival in Washington， D.C. last month. The vehicles shown are designed to reduce Americas dependence on oil and help the environment. The festival takes place in several American cities.

There are exhibits of cars， buses and motorised bicycles at the festivals. Most of them use little petrol or use another kind of fuel? such? as? bio-diesel or electricity. People are also advised to consider simpler ways of getting around， such as walking， biking and using public transportation systems. Personal transportation vehicles， called scooters， are also gaining interest. These methods all avoid or reduce the use of petrol， which are made from oil.

Individuals， students and carmakers took part in the festival. They wanted to show people what their so-called “green” vehicles could do. Teams of students competed for prizes.

The United States has less than five percent of the worlds population， but it uses about twenty-five percent of the worlds oil. More than half of the nations oil is imported. Festival organisers say progress in technology is making it possible for Americans to reduce their dependence on oil for transportation. That is because the kinds of energy-saving vehicles are increasing. Vehicles powered by bio-diesel fuel or electricity， for example， can reduce oil use by as much as ninety-nine percent. They also say that efforts to reduce oil imports in the United States would also have important environmental and public health benefits. The burning of oil as fuel is responsible for changes in the world climate. When petrol is burned in cars， it also pollutes the air. This leads to breathing problems， cancer and other health problems.

Organisers think that strong public demand for vehicles that use other kinds of fuels could force carmakers to produce more such vehicles. That is the goal of the Green Transportation Festival.

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Tips： First， find the topic sentence of each paragraph.

Second， shorten these topic sentences， leave out unnecessary words， and keep the main part.

Third， organise them together by using conjunctions.

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