There is a new study on teenagers who are between 13 and 19 years old. The study shows that today's teenagers are growing up more slowly than those before.
Scientists from San Diego State University have worked on a study on the behaviors of 8million teenagers in seven different countries over the past 40 years. The results tell us that compared to the teenagers in the past, today's teenagers are less responsible (负责任的). And it takes them more time to do the same things than their parents did. They are also less likely to have a part-time(兼职的) job. What's more, when they get older, they begin to know that they should help their parents do housework, while their grandparents and parents helped do housework at a very early age. "This is a' slow life way',"said Professor Jean Twenge.
"The development of today's teenagers has slowed down. 18-year-olds are more like15-year-olds in the past," added Professor Twenge. "Teenagers today are taking much fewer risks than those in the past did. "Scientists have also found that more teenagers spend longer time living with their parents instead of renting(租) their own rooms or apartments.
One of the reasons for these behaviors is that today's teenagers would like to spend much time online. They keep on connecting(连接) with social media, watching videos or playing games on theInternet but not living in the real world. Another one is that parents do much for their children and protect them too much. In fact, parents had better let their children do everything by themselves. They should try their best to make their children become independent as soon as possible.
a. their parents do too many things for them
b. it's difficult for them to do well at school
c. they always live in the real world
d. they spend too much time online
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B . 
C . 
D . 
