text: Johnson was present at the closing ceremony of the 2008 Summer Olympics in Beijing as London 's representative to receive the Olympic flag from Guo Jinlong , the Mayor of Beijing in order to announce formally London as Olympic host city .
simplified: Johnson was present at the closing ceremony of the 2008 Beijing Olympics as London 's representative to receive the Olympic flag from Guo Jinlong , the Mayor of Beijing in order to formally announce London as Olympic host city .