Whenyourchildissupposedtodoinghomework，theychatting，theirfriendsonFacebookorplayinggames'!Ifyouwantyourchildtodoagoodjobwiththeirhomeworkandgetgoodgradesthenyoumaywanttostartteachingthemthatthisisn'ttheb
When your child is supposed todoing homework，they chatting，their friends on Facebook or playing games'!If you want your child to do a good job with their homework and get good grades then you may want to start teaching them that this isn't the best idea．Many studies have shown that multitasking（多任务化）doesn't work，even though your child is probably proudly claiming they can do ten things at once!Many people believe that they can perform two or more tasks meanwhile，but Dr Edward Hallowell says this is a myth．The reality is that shifting tasks results in poor job performance．
New devices such as smartphone，iPads，games and social networking sites make it very easy to multitask and"attention share"resulting in difficulty focusing on the task at hand such as listening in the classroom or doing homework．"Unfortunately．the brain actually rewards kids for multitasking even though performance on every task gets worse and worse．Kids don't know that they are doing worse because they feel better when they multitask，"says Dr Edward Hallowell．
Since the appearance of hand-held devices and social networking sites like Facebook，teachers have noticed a difference in academic performance，critical thinking skills and how information is processed．"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 are more likely to allow themselves to be distracted（分散精力），to tune out and switch over to Facebook or using their cell phones rather than working harder at understanding a difficult subject or problem．In the long run，the shifting of attention by multitasking affects grades．One study showed that kids that use the Internet while in class did poorly on tests resulting in lower grades．
33．What does the passage mainly talk about？___
A．Multitasking is not truth but