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①因此把才学比作剑，当使用的时候就拿出来，而不用的时候就藏入鞘中，不将其把玩炫耀。否则．很少有不因此而得祸的
②自古以来，才学外露的人都遭到灾祸，没有一个幸免，怎么不令人为此忧心忡忡呢
③才学是君子用来进行身心的修养，而并非用来自负骄矜的工具；君子是以才学来治理社会，而并非用以自夸炫耀的
④之所以这样说，并非才能和学识本身有什么过错，而是错误应用造成的
⑤没有才能和学识，士人会感到羞耻；具备才能和学识，士人会因此而担忧将以上5个句子重新排列，语序正确的是（　　）。

A.⑤④③①②
B.②①④③⑤
C.②④①③⑤
D.③⑤④②①

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为什么货币需求对利率r越敏感，财政政策效果越大?

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Text 1 Smartphones have by now been implicated in so many crummy outcomes-car fatalities,sleep disturbances,empathy loss,relationship problems,failure to notice a clown on a unicycle-that it almost seems easier to list the things they don't mess up than the things they do.Our society may be reaching peak criticism of digital devices.Even so.emerging research suggests that a kev Droblem remains underaDDreciated.It involves kids'development,but it's probably not what you think.More than screen-obsessed young children,we should be concerned about tuned-out parents.Yes,parents now have more face time with their children than did almost any parents in history.Despite a dramatic increase in the percentage of women in the workforce,mothers today astoundingly spend morc time caring for their children than mothers did in the 1960s.But the engagement between parent and child is increasingly Iow-quality,even ersatz.Parents are constantly present in their children's lives physically,but they are less emotionally attuned.To be clear,I'm not unsympathetic to parents in this predicament.My own adult children like to joke that they wouldn't have survived infancy ifl'd had a smartphone in my clutches 25 years ago.To argue that parents'use of screens is an underappreciated problem isn't to discount the direct risks screens pose to children:Substantial evidence suggests that many types of screen time（especially those involving fast-paced or violent imagery）are damaging to young brains.Today's preschoolers spend more than four hours a day facing a screen.And,since 1970,the average age of onset of regular screen use has gone from 4 years to just four months.Some of the newer interactive games kids play on phones or tablets may be more benign than watching TV or YouTube,in that they better mimic children's natural play behaviors.And,of course,many well-functioning adults survived a mind-numbing childhood spent watching a lot of cognitive garbage.（My mother-unusually for her time-prohibited Speed Racer and Gilligan's Island on the grounds of insipidness.That I somehow managed to watch every single episode of each show scores of times has never been explained.）Still,no one really disputes the tremendous opportunity costs to young children who are plugged in to a screen:Time spent on devices is time not spent actively exploring the world and relating to other human beings.The contact between parents and cluldren is poorer because______

A.parentshardlyhavesparetime
B.childrenaredistractedbydigitaldevices
C.affectiveinteractionishardlyinvolved
D.parentsmaybeaddictedtosmartphones

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