Section CDirections:There are two passages in this section. Each passage is followedby somequestions or unfinished statements. For each of them there are four choices marked A), B),C) and D) You should decide on the best choice.Passage OneCollege students seem unable to get off their cellphones Professors find it challenging toget students to stop using their cellphones in class Doug Duncan, a professor at the Universityof Colorado has come up with a solution to smartphone distraction in his astronomy class.He has publisheda paper showing that, at his college, more than 75 percent of undergradsreported texting while in class, and that inclass texting was linked to an average drop of halfa letter grade in the course.Ten percent of the grade in Duncan's class comes from participationpoints. To reducesmartphone use, he carried out an experiment. While sharing his plan with his colleagues,he wrote:“1 asked my students tovote (投票表决) ifl should offer one participation point fortaking out their cellphone, turning it off and leaving it out on my desk. To my amazement100% voted yes. So they all took out their phones, put them on the desk, and we had anextremely engaged class." Three class meetings later, the no-cellphone rule is still goingstrong.Should other professors follow Duncan's lead? Larry Rosen, a research psychologist atCalifornia State University, studies smartphone use among college students. He doesn't thinksimply rewarding students for turning off their phones is a good strategy. “It doesn't get atthe real issue of why students are distracted," he explains. "Most college students are heavyusers who are going to get anxious within 10 or 15 minutes if they can't check their phones."In experiments,Rosen has shown that students' heart rate and other vital signs (生命体征)rise when they hear their phones ring and can't answer them. He says that putting the phonesin sight, but out of reach, even when turned off, will only increase that anxiety and thedistraction that comes with it.Rosen has his own solution.“I start by calling a tech break, where they can check theirphone for one minute, every 15 minutes," he says. “Over time you can increase it to 20, 25.And within a couple weeks you can get them to go 30 minutes without needing it.”21. What is the finding reported in Doug Duncan's published paper?A) Most students at American colleges texted while in class.B) Professors were not effective in stopping phone use in class.C) Ten percent of his texting students could not pass the course.D) Texting reduced course grades by half a letter on average.22. What experiment did Duncan carry out to reduce cellphone use in class?A) Students using their cellphones could lose one point.B) The whole class had to leave cellphones on the desks.C) He designed class activities based on voting on the phone.D) Cellphones had to be kept on the teacher's desk if used.23. Larry Rosen advises other professors not to follow Duncan's lead because____A) it may work at the beginning but the temptation is too strong.B) it can only work well with some students but not with others.C) it works for a short while before most students get anxious.D) it really distracts heavy users, who actually pretend to listen.24. What has Rosen found in his experiments about students not allowed to use cellphones?A) They were willing to put their phones in sight but out of reach.B) They had faster heartbeat when unable to answer the phone.C) They couldn't resist the distraction for a minute and listen seriously,D)They could control their anxiety when focusing on learning,25. What solution does Rosen offer?A) Students are allowed to check their phones every 15 or more minutes.B) He turns his class into several short periods of 15 minutes or more.C) Students can check their phones for just one minute in every classD) He ells tech support to block the connection every few minutes.Passage TwoTeens are masters at keeping themselves occupied in the hours after school until way pastbedtime. When they're not doing their homework (and when they are) they're online andon their phones, texting, sharing, you name it. Of course before everyone had a Facebookor Instagram account teens kept themselves busy, too, but they were more likely to dotheir chatting on the phone, or in person when hanging out. It may have looked like a lotof aimless hanging around, but what they were doing was experimenting, trying out sill,and succeeding and failing in tons of tiny real time (实时的) interactions that kids today aremissing out on.Nonetheless, modern teens are learning to do most of their communication while lookingat a screen, not another person. Certainly speaking indirectly creates a barrier (障碍) to clearcommunication, but that's not all. Learning how to make friends is a major part of growingup, and friendship requires a certain amount of risk-taking, This is true for making a newfriend, but it's also true for maintaining friendships. When there are problems that need to befaced, it takes courage to be honest about your feelingsand then hear what the other personhas to say. Learning to effectively cross these bridges is part of what makes friendship funand exciting. and also scary.But when friendship is conducted online and through texts, kids are doing this whenmany of the most personal-- and sometimes frightening一aspects of communicationare removed. I's easier to keep your guard up when you're texting, so less is at risk. Youaren't hearing or seeing the effect that your words are having on the other person. Becausethe conversation isn't happening in real time, each party can take more time to consider aresponse. No wonder kids say calling someone on the phone is“too intense"一it requiresmore direct communication, and if you aren't used to that it may well feel scary. Ifkids aren'tgetting enough practice relating to people and getting their needs met in person and in realtime, many of them will grow up to be adults who are anxious about the primary means ofcommunication for humans一talking.26. The author thinks that after school teens should spend time____.A) trying their hand at some real skilled workB) relaxing by having an account to chat onlinec) sharing notes and doing homework togetherD) talking to people and improving social skills27. What does the author mean by“crossing these bridges" (Line 7, Para 2)?A) Looking at the screen and speaking indirectly,B)' Taking risks and having courage to communicate.C) Starting friendships and trying to maintain them.D) Finding friends and getting help to solve problems.28. What does the author say about the advantage of chatting online?A) Making friends more easily.B) Less possibility of miscommunication.C) Feeling free to share one's views.D) Having more time for what to say.29.Whatistheauthor'sviewoffacetofacecommunication?A)Itishighlypersonalandscary.B)Itrequireskeepingone'sguardup.C)Itmaynotgolongenoughtotalkdeeply.D)Itworkseffectivelywithnoiseremoved.30.Theauthorexpresseshisconcernattheendofthepassagethat____.A)teenswillfeelscaredofexpressingthemselvesfreelyB)teenswillnotdecidecarefullyhowtomakefriendsC)teenswillgrowupnotknowinghowtotalkinpersonD)teenswillbetoodirectintheirmannerofspeaking注：以下答案1代表21题答案，2代表22题答案，依次类推。