There could be disadvantages,however,to the busing cutbacks.If every formerly bused student begins walking to school,it’s an environmental win—but if too many of their parents decide to drive them instead,the overall carbon footprint can grow.Replacing buses with many more parent-driven cars can also increase safety risks.A 2011 report concluded students are 13 times safer on a school bus than in a passenger car,since buses have fewer accidents and withstand(经受住)them better due to their size.And some students complain about the long morning hikes,particularly when the route contains a really big hill.

　　1.According to the passage,how does Nia Parker go to school now?

　　A.By bus. B.By car. C.On foot. D.By bike.

　　2.In regard to walking to school,modern parents seem much concerned with the　. 

　　A.safety of their kids B.kids’ physical strength

　　C.time spent on the way D.changes in the route

　　3.To save money,some schools choose to　. 

　　A.shorten the school week B.take the shortest routes

　　C.stop using school buses D.use fuel-efficient buses

　　4.Busing cutbacks may lead to　. 

　　A.fewer complaints about long morning hikes

　　B.more students taking public transportation

　　C.an increase in carbon dioxide emissions

　　D.a decrease in the safety of school buses

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