A
(2018·唐山市五校联考)Smartphones are an 1. (importance)part of everyday life for most teens today.But are teens addicted to their phones? One out of every two teens in the US and Japan feel they are，according to 2. recent study.
The study 3. (base)on an April 2017 survey of 1,200 teens and parents.
It's the first such study in Japan, 4. 90 percent of parents and teens own smartphones.It's also the first 5. (compare)those results with 6. (exist)US data from Common Sense Media about digital media use among families in North America.
Most parents surveyed said 7. believed their teens were addicted to mobile devices.Many of the 8. (adult)said they also felt addicted to their own phones.
Willow Bay，the dean of USC Annenberg in Los Angeles，said，“ These shifts are happening 9. (fast)and more dramatically than any change 10.
recent history.”
【答案】 1.important 2.a 3.is based 4.where 5.to compare 6.existing 7.they 8. adults 9.faster 10.in
