Facebook—with its requirement that users (1)_____ at least 13—and Twitter are indeed geared toward older teenagers and adults. P

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问题     Facebook—with its requirement that users (1)_____ at least 13—and Twitter are indeed geared toward older teenagers and adults. Parents should follow those(2)_____ because children younger than 13 are not developmentally(3)_____ for the subtle differences of the social interactions on those sites. Social media are(4)_____ interwoven with kids’ lives, though, that to bar them from using the sites at all is not(5)_____. In fact, if parents don’t let their children use social media, they are not (6)_____them with the skills they need to function in the(7)_____ world.
    Social networking today is really just a(n) (8)_____part of the way kids and teens are(9)_____. They use social networking to(10)_____ some of the natural developmental issues(11)_____ they are going through.(12)_____ using social media can come(13)_____ when kids use it to bully or tease classmates, so it’s important to teach children that they are(14)_____ with real people online. Parents can use the chat functions on sites such as We-bkinz, which is geared toward children ages 6 to 13,(15)_____ a way to teach kids to be kind in the online world. It’s also important to(16)_____ how your child is reacting to social media to make sure they’re not becoming(17)_____ with using it, or upset by things that they have seen. Trouble signs(18)_____ kids who are acting withdrawn or are obsessive about social networking. If your child is only happy when using social media, or (19)_____ sad after using it, those are signs that it is(20)_____.
(13)

选项 A、at a loss
B、at a cost
C、in vain
D、in return

答案B

解析 空格后的从句意为“当他们使用网络来欺负或嘲笑同学”,这对孩子来说当然是有害处,故选at a cost,词组come at a cost意为“需付出代价”。at a loss“困惑不解”;in vain“徒劳”;in return“作为回报”。
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