During proof­reading，dance music，such as David Guetta，had the biggest positive impact with participants increasing their speed by 20 per cent compared to tests undertaken with no music at all.

　　Dance music also had a positive effect on spell­checking with a 75 per cent pass rate compared to 68 per cent when no music was played at all.

　　The research，undertaken by Brighton­based Mindlab International，suggests that silent offices may be the least productive.

　　“The music experiment showed that when listening to music，nine out of 10 people performed better，” said Dr.David Lewis，Chairman of Mindlab International.

　　“Proper music enables people to quickly process and keep information，regulate their behaviors，make good choices，solve problems，plan and adjust to changing mental demands，” a senior investigator of Mindlab International explains.

　　“While many schools are cutting music programs and spending more and more time on test preparation，our findings suggest that musical training may actually help to set up children for a better academic future，” added Dr.David Lewis.

　　5．What does the passage mainly talk about?

　　A．The positive relationship between music and efficiency.

　　B．The speed and accuracy of problem­solving tasks.

　　C．The comparison of different kinds of music.

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