“今夫封建者，继世而理；继世而理者，上果贤乎，下果不肖乎？则生人之理乱未可知也。将欲利其社稷以一其人之视听，则又有世大夫世食禄邑，以尽其封略，圣贤生于其时，亦无以立于天下，封建者为之也。岂圣人之制使至于是乎？”根据以上材料，作者认同的是（     ）

    I'm a middle school student from America. I live far away from my school. So I often go to school by bus. It takes me about twenty minutes from my home to school.

    But at my school and other schools in our town, there is a "Walk to School Day". It is on Wednesday every week. On that day, parents send their kids to a bus stop. There are many bus stops in our town. At each bus stop, two adults lead us to walk to school together.

    "Walk to School Day" stops us taking cars or buses. That is good for the air and we can get exercise too. On the way to school, we talk to each other. We can also make new friends. I like "Walk to School Day". I walk about five kilometers with other students on that day. Our school will give some students beautiful backpacks if they do well. And I got one last year.