【答案解析】[听力原文] 95-97 Fred Pully, the owner of Wheels for Hire, the largest moving and transportation company in America, has recently announced his plans to start using biofuels to power the company's entire trucking fleet. Mr. Pully says the changeover will .be gradual. Although the company's heads were worried about such a drastic change, the communities and supporters of Wheels for Hire have responded positively. Biofuels are fuels made from renewable resources and cause half as much pollution as regular fuels. Mr. Pully says the first step is to get their truck engines updated, so that they can process the new kind of fuel. Mr. Pully has also promised to make other changes within the company in order to promote environmental health and safety.