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 word"ersatz"（Para.3）most probably means_____
词汇理解题。根据定位词定位到文章第三段。根据单词所在句的句意：但是父母和孩子之间的交流质量越来越低，甚至是。父母通常在孩子的物质生活上投入关心，但在情感上，投入却很少。比质量低还差的应该是假的，不真实的，故C项为正确选项。【干扰排除】根据以上分析可知，A项invalid“无效的”、B项disputable“有争议的”、D项insufficient“不足的”均不符合原文语义，故均排除。
