Researchers recruited（招募） participants from views of the BBC’s science show “Bang Goes the Theory”．More than 8, 600 people aged 18 to 60 were asked to play online brain games designed by the researchers to improve their memory, reasoning and other skills, for at least 10 minutes a day, three times a week．

　　They were compared to more than 2, 700 people who didn’t play any brain games, but spent a similar amount of time surfing the Internet and answering general knowledge questions. All participants were given an “IQ test” before and after the experiment．Researchers said the people who did the brain training didn’t do any better on the test after six weeks than people who had simply been on the Internet．On some sections of the test, the people who surfed the Net scored higher than those who played the games.

　　The study was published online by the journal Nature. “If you are playing these games because they’re fun, that’s absolutely fine, ” said Adrian Owen, assistant director at Britain’s Medical Research Council, the study’s lead author．“But if you’re expecting these games to improve your IQ, our data suggests this isn’t the case．”

　　72．What’s the purpose of online brain games according to the designers?

　　A．To take part in the study.

　　B．To draw public attention to computers.

　　C．To provide free service for teenagers.

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