These buses, on average, use 4 liters of diesel (柴油) fuel to travel less than 16 kilometers. When the school year began last fall, diesel averaged 55 cents a liter nationally. The price nearly doubled by the end of school in June.

　　Bob Riley is the spokesman for the American School Bus Council. He says fuel prices negotiated(商议) for schools are not lower than others have to pay. As a result, schools are looking for ways to reduce transportation costs. Bus routes are being redrawn or, in some cases, canceled. Some areas are buying buses that use natural gas or other alternative fuels.

　　Other steps include fewer field trips and less travel by sports teams. Some school districts may end any bus service not required by law.

　　Studies show that school buses are the safest form of transportation to and from school.

　　The American School Bus Council says cuts in bus service are bad for children and possibly the environment. It says removing buses from the road will mean an increase in other vehicles transporting students. Spokesman Bob Riley says another concern is that reducing

　　bus service might reduce attendance.

　　It could also get more children to walk or bicycle to school. That would surely make people happy at the National Center for Safe Routes to School. More kids walking or biking safely to school is the aim of a 3-year-old federal program, part of an international movement. The goal is to increase physical activity and reduce air pollution.

【2017届高考英语总复习闯关密训卷 Unit4《Sharing》选修7】相关文章：

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练七

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M6《Unit 1　Laughter is good for you》

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M5《Unit 3　Science and nature》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (57)

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修1 unit3《Travel journal》

★ 2017届高考英语二轮复习课时训练：4（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (8)

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修3 Unit 2《Language》

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M7《Unit 3　The world online》

★ 2014届高考英语一轮复习课时作业(八)必修2Module 2《No Drugs》（外研版）