9.从“河道宽浅”得知，该河流流经区域地形平坦，流速较慢，河流的下蚀弱、侧蚀强，故河床泥沙沉积较多。河床沙主要来源于风力与流水堆积，春季地表干燥，风力大，易扬沙，夏季河流含沙量大，泥沙沉积量多，故选A。10.图示河段地貌为大量泥沙和风沙沉积而成，土层深厚，地形平坦，河流流速缓，流水冲刷作用和下蚀较弱。故选C。11.三湖河口站到昭君坟站河流自西向东流，水温变化不大，且落差较小，但昭君坟站的下游河道变窄，上游冰凌向下游流动过程中易在此堵塞形成凌汛。故选B。

第二节（共5小题；每小题2.5分，满分12.5分）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。Volunteering means carrying out a duty or a job without expecting payment or reward.The concept is verypopular in advanced or rich countries.But in some countries,many people look at volunteering as a waste of timeand effort.16.One is immediately seen as selfless and helpful when one volunteers to help out someone such as a friend,teacher or parent.17 when you help a teacher to clean the classroom or get involved in a cleanliness campaignat the school level or other community projects.Teachers and adults would look at a young person who volunteershis or her time for certain activities as mature,responsible and deserving of respect.In addition,volunteering with an organization such as orphanages(),community centers and othernon-profit organizations allows you to interact with society at large.In addition to helping these organizationscarry out their duties,you not only gain experience but can learn a variety of skills.18 Even though they arenot being paid,through volunteering time,effort and skills,they would learn more than what money can buy.19 For example,if you volunteer your time regularly at a charity organization,you would learn how theorganization works and the importance of teamwork,and other essential ideas related to the day-to-day operationsof the organizations.Thus,with so many benefits,students,in particular,should be allowed to participate in volunteer activities.20A.You will feel proudB.You will feel you are respectedC.This is especially beneficial to studentsD.One should actively be involved in volunteeringE.However,one can gain many benefits from volunteeringF.They can learn useful interpersonal and organizational skillsG.Volunteering also exposes one to many interesting ideas and issues【语篇导读】本文是一篇说明文。文章主要介绍了志愿服务是指在没有报酬的情况下完成任务或工作。这一概念在发达国家或富裕国家非常流行，并介绍了一些志愿服务的好处。16.E Volunteering means carrying out a duty or a job without expecting payment or reward.Theconcept is very popular in advanced or rich countries.But in some countries,many people look at volunteeringas a waste of time and effort..并结合后文介绍的志愿服务的好处可知，本句与上一句构成转折，应是在说一个人可以从志愿服务中获得很多好处。故E项符合语境。17.B when you help a teacher to clean the classroom or get involved in a cleanliness campaign at theschool level.,responsible and deserving of respect.可知，后文提到从事志愿活动会让老师和成年人认为你值得尊敬，推测本句是在说明帮助老师打扫教室或参加学校和其他社区项目的清洁运动可以带来尊重感。故B项符合语境，且B项中的feel you are respected与下文中的deserving of respect呼应。l8.C根据上文In addition,volunteering with an organization such as orphanages..…you not only gain experiencebut can learn a variety of skills.Even though they are not being paid,through volunteering time,effort and skills,.they would learn more than what money can buy..可知，本句承上启下，说明做志愿者，尤其是对学生来说可以带来好处。故C项符合语境。19.GFor example,if you volunteer your time regularly at a charity organization...the day-to-dayoperations of the organizations.可知，后文的例子说明做志愿者可以接触一些重要的知识和思想。故G项符合语境。20.FThus,with so many benefits,students,in particular,should be allowed to participate involunteer activities..可知，本句承接上文，说明学生应该被允许参加志愿活动的原因。故F项承接上文，解释原因，符合语境。

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