Ⅱ.完形填空

　　(2017·甘肃兰州市高考诊断)When your child is supposed to be doing homework, are they chatting with their friends on Facebook or playing games? Many studies have shown that multitasking doesn't ____1____， ____2____ your child is probably proudly claiming they can do ten things ____3____！ Many people believe that they can ____4____ two or more tasks at the same time, but Dr. Edward Hallowell says this is ____5____. The reality is that multitasking ____6____ poor job performance.

　　New hand－held ____7____ such as smartphones, iPads, games and social networking sites make it very easy to multitask and ____8____ attention leading to difficulty focusing on the task ____9____， such as listening in the classroom or doing homework. "____10____， the brain actually ____11____ kids for multitasking even though your child's performance on every task gets worse and worse. Kids don't know that they are doing ____12____ because they feel better when they multitask，" says Dr. Edward Hallowell.

13____ the appearance of hand－held devices and social networking sites, teachers have noticed a difference in ____14____ performance, critical thinking skills and how information is ____15____. "Multitasking prevents people from gaining a deep understanding of the information they are trying to learn，" says Dr. Edward Hallowell. Kids have a difficult time sticking with a "difficult to understand" topic and ____16____ to allow themselves to be distracted (注意力分散的), to tune out and switch ____17____ to Facebook or using their cellphones ____18____ working harder at understanding a difficult subject or problem. In the long ____19____， multitasking affects grades. One