According to a 2018 study from San Francisco State University， nearly 2． 4 billion people around the world used a smartphone in 2017． By the end of 2019， more than a third of the global population will be using a smartphone．

However ， smartphone technology can be a double ﹣ edged sword ．On the one hand， it sends us unlimited amounts of information． On the other hand， using a smartphone may become an addiction．

Erik Peper and Richard Harvey are both health education professors at San Francisco State university． They led the study． Peper explains that smartphone addiction forms connections in the brain that are similar to drug addiction． And these connections form slowly over time． Also， addiction to social media may affect our emotional state． The two professors asked 135 university students about their habit of smartphone use and their feelings． They found that students who used their phones the most reported higher levels of feeling lonely， depressed and anxious．

Peper and Harvey do not blame users for their technology addiction． They believe it is the tech industry's desire to make more money that is to blame for the technology addiction． The researchers warm that workers in the technology industry know how to control our brains and turn us into addicts．

But the researchers say that we can limit our brains to be less addicted to our phones and computers． Erik Peper suggests timing off our phones before we sleep or do something important． The researchers also suggest taking control of when and where you answer texts or emails． You do not need to answer them all． And you certainly don't need to answer them as soon as you get them． They also suggest putting limits on the time you spend on social media．If you want to catch up with friends on Facebook，set aside a small amount of time to it．you should focus on important tasks and do not allow technology to disturb you．

根据短文内容选择最佳选项．

（1）What can we infer from Paragraph 1？ 　　

A．	Smartphone use has become extremly common．
B．	Most young people can't live without smartphones．
C．	Smartphones make our life more colorful and convenient．
D．	Most people consider smartphones as the greatest invention．

（2）The underlined sentence in Paragraph 2 means smartphone technology 　　．

A．	has a brilliant future
B．	can be better than most people think
C．	has both advantages and disadvantages
D．	can give us unlimited amounts of information

（3）What did Enk Peper and Richard Harvey find about smartphone use？ 　　

A．	It can help reduce loneliness．
B．	It's more popular with students．
C．	It's preferred by young people feeling lonely．
D．	It can harm students' emotional state in many ways．

（4）What does the last paragraph mainly want to tell us？ 　　

A．	Social media is't that important to us．
B．	We can train our brina to do many things．
C．	We shouldn't become addicted to our smartphones．
D．	There are ways to deal with smartphone use addiction．

（5）Which of the followings is True？ 　　

A．	We can use smartphones to deal with loneliness．
B．	An addicion can't be controlled if we still use smartphones．
C．	There were nearly 2． 4 billion people using smartphones in the world in 2017．
D．	Stop using smartphones if you don't know when and where you should answer the emails．