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阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
    School bus drivers transport kids to and from school.__16__ Along with their transportation duties，bus drivers commonly assume other roles in the school district.
    The most obvious responsibility of a school bus driver is to transport students to and from school or activities in a timely and safe manner.This includes showing up to each home or stopping at the scheduled time and informing parents of any change in pick­up or drop­off times.The driver also has to drive safely in all types of weather.__17__
School bus drivers not only have to drive safely and watch the road，but they also normally have responsibility for the conduct of students on their buses.__18__   Monitoring students' behavior and stopping any horseplay are immediate duties.In some cases，students are assigned(分配)seats in the front of the bus if they have regular behavioral problems.
__19__ This includes regular checks on brakes，tires，turning signals and mechanical(机械的)equipment.School districts often have regular daily checklists whereby drivers must confirm that they have checked on various safety items.If problems are detected with any of these components，the bus is normally taken in for repair work and the driver uses an alternative bus until his normal one is ready to go again.
Each day，school bus drivers have to log(记录)a variety of activities.__20__   They also log the miles they drive on their routes.Additionally，drivers make notes when fuel is filled and  the amount.These daily logs help ensure accuracy in routes.
A．It's extremely important.
B．They are usually tasked with clean­up duty.
C．It's really hard to control kids' on­bus behavior.
D．They report the number of riders on their buses.
E．They also take school sports teams and other groups on trips.
F．Regular drivers are responsible for monitoring the safety of their buses.
G．Buses have large mirrors over the front window that give   drivers the ability to see the entire bus.
[语篇解读]　本文是一篇说明文。文章介绍了校车司机的职责。
16．解析：上句(校车司机接送孩子上下学)介绍的是校车司机的一项接送责任(transportation duty)，再根据该空后的transportation duties(复数形式)可知本空应是校车司机的另外一项transportation duty，E项(他们还有接送学校体育队和其他团体的责任)符合此处语境。
答案：E
17．解析：上文提到不管天气如何，校车司机都必须安全驾驶。A项“这很重要”符合此处语境。
答案：A
18．解析：根据下句(监视学生的行为和制止任何玩闹是即时责任)中的monitoring(监视)可判断G项(校车的前窗上有很大的镜子，可以让司机看到整辆校车)为本题答案。
答案：G
19．解析：下文都是关于校车司机负责有关校车安全保养方面的内容，故答案为F项(平常开校车的司机有责任检查校车的安全)。
答案：F
20．解析：根据第一句可知本段讲的是校车司机的另一项职责：记录各项活动的数据。D项“报告坐车人数”应是记录数据中的一项，故为答案。
答案：D

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