Unit 3 Computers Most kids have cellphones or tablets (平板) and are texting or using social media all the time. Experts say that parents should use apps to watch out for their children's online activity.According toa survey, 70 percent of U．S. teens carry cellphones, and Russ Warner, the CEO of Net Nanny, is in the business of protecting kids online. His best advice to parents is to know what is out there and to plan in advance.“Put a plan into place because kids like to feel protected，” Warner said. “They like to feel like Mom or Dad is helping.”According to another study, almost 90 percent of children have seen cyber bullying (网络欺凌) in the last year. However, Warner said only 50 percent of parents talk with kids about avoiding these experiences.“That means the other half don't and that's a problem，” he said.Warner often speaks to parent groups concerned about keeping their teens safe, “Oftentimes (时常地) if we can't control or we don't understand something, we avoid it and we can't do that anymore.”He said parents need to talk to their children about online danger, and then they need to use safety software. Parents should know who is trying to communicate with their children and what they are watching online.Warner added parents also need to understand phone settings ( 设 置 ). iPhone settings come with restrictions ( 限制 ) that are easy to set. Parents can enable restrictions with a code that they know, and their child does not. Parents can also set 1phones to not allow apps to be downloaded without a passcode.Section_ⅠWarming Up & Reading — PrereadingWHO AM I?Over time I have been changed quite a lot①. I began as a calculating② machine in France in 1642....
