[单选题]在道路危险货物运输过程中,下列做法中错误的是( )。
A.因住宿或发生影响正常运输的情况需较长时间停车时,驾驶人员、押运人员应采取相应警示和安全措施;运输剧毒化学品或易爆危险化学品的,除采取警示和安全措施外,还应向当地公安机关报告
B.驾驶员一次连续驾驶8小时应休息20分钟以上
C.出车前,检查车辆轮辋有无裂纹变形、螺栓是否完整紧固
D.运输剧毒化学品等有规定运行路线和时间的危险货物运输车辆,要按照既定的路线和时间运行,不得随意改变

The easiest way to start an academic brawl is to ask what an educated person should know. The last time Harvard University tackled that question was in 1978, when it established its Core Curriculum, which focused less on content than on mastering ways of thinking. Like Harvard’s so-called Red Book standards of 1945, which helped inspire a generation of distribution requirements, the core had broad resonance at other major universities. Now, after a four-year process initiated under controversial former president Lawrence Summers, the nation’s most famous university has come up with a whole new set of guidelines that proponents say will help clarify how liberal-arts subjects like philosophy and art history shed light on the hurly-burly of more quotidian topics. "Students will be more motivated to learn if they see a connection with the kinds of problems, issues and questions they will encounter in later life," says interim president Derek Bok. Harvard is