A team of US psychologists have found that talking to another person for ten minutes a day helps with memory. "Socializing is just as effective as more traditional kinds of mental exercise in memory and intellectual performance," Oscar Ybarra, a psychologist at the University of Michigan Institute for Social Research, said in a statement. In one investigation, they analyzed data on 3610 people, aged 24 to 96. They found that the higher their level of social interaction  , the better their cognitive   functioning.  Social interaction includes getting together or having phone chats with relatives, freinds and neighbors. In another experiment, the researchers conducted lab tests on 76 college students, aged 18 to 21, to evaluate how social interactions and intellectual exercises affected the results of memory and mental performance tests. The students were divided into three groups: the social interaction group had a discussion of a social issue for 10 minutes before taking the tests; the intellectual activities group completed three tasks (including a reading comprehension exercise and a crossword puzzle) before the tests; and a control group   watched a 10-minute clip   of the Seinfeld television show. "We found that short-term social interaction lasting for just 10 minutes improved participants' intellectual performance as much as engaging in so-called 'intellectual' activities for the same amount of time," Ybarra said. The study was expected to be published in the February issue of the journal Personality and Social Psychology Bulletin. Which of the following questions may be asked in the social interaction group in the experiment?
What does the author want to show us? Do you like living in a big city or a small one? Which word can be used to fill in the blank? What is the main idea of the second paragraph?