If you find yourself unable to go more than 15 minutes without reaching into your pocket, pulling out your smart phone and checking your e-mail or WeChat, don’t panic. You are hardly alone. A recent survey shows that smart phone users have developed “checking habit” ---frequently checks of e-mails and other Apps. The checks normally lasted less than 30 seconds and were often done every 10 minutes.

On average, the study subjects check their phones 34 times a day. And the strangest part is that they don’t even realize they are doing it. "I hadn’t told my hand to reach out for the phone. It seemed to be doing it all on its own,” wrote Elizabeth Cohen, a medical correspondent for CNN who watched her right hand sneaking away from her side to grab her phone while sitting on the table at dinner with friends.

Loren Frank, a neuroscientist at the University of California, San Francisco (UCSF), explains that checking smart phones is rewarding in some way. "Each time you get an e-mail, it’s a little bit exciting, because it means a positive feedback that you’re an important person,” Frank told CNN. Once the brain becomes used to this positive feedback, reaching out for the phone becomes an automatic action you don’t even think about consciously, said Frank. Professor Clifford Nass of Stanford University added that constantly checking your smart phone is also “an attempt to not have to think hard but feel like you are doing something”.

However, every coin has two sides. This habit can cause problems. Studies show that whenever you take a break from what you are doing to check your smart phone, it is hard to go back to your original task, according toAdam Gazzaley, a neurologist at UCSF. That’s not the worst. A survey by South Korean marriage consulting agency Duo earlier this year shows that smart phones are destroying intimate relationships, reports The Korea Herald(韩国先驱报). About half of the respondents said they had had fights with their boyfriend or girlfriend because of smart phones. And 32.8 percent of them fought about smart phone obsession. In this respect, checking smart-phones at regular intervals                                        is a bad habit. But just as an old saying goes, “Bad habits die hard.”

So to get rid of the checking habit, Cohen suggests establishing phone-free times and zones.

【小题1】What does the passage mainly talk about?

A．A smart-phone consumption survey.

B．The advantages of smart-phone checking habit.

C．The obsession with smart-phone checking.

D．They ways to quit smart-phone checking habit.

【小题2】According to the author, what is the most unusual part of the survey?

A．Most of the subjects have developed “checking habit”.

B．The checks typically last 30 seconds.

C．The subjects tend to check their smart-phone frequently.

D．The subjects are unaware of the action when checking their smart-phones.

【小题3】With the words by Elizabeth Cohen in Paragraph 2, the author intends to show __________.

A．what a “checking habit” is.

B．the common existence of “checking habit”.

C．the unconsciousness of “checking habit”.

D．the harm of “checking habit” to people.

【小题4】According to Loren Frank, checking smart-phones, frequently is __________.

A．worthwhile in some way.

B．unimportant for those busy people.

C．necessary to think hard.

D．likely to cause neurological diseases.

【小题5】According to Paragraph 4, what negative effects may “checking habit” have on students?

A．They might fail in their exams.

B．They might get distracted from their work.

C．They would make friends with unfamiliar people.

D．They would manage to break up with their close friends.