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Photo taken on June 23 Thomas Delaney Jersey , 2016 shows the Rio 2016 olympic village in Rio de Janeiro, Brazil. Rio 2016 unveils athletes' village to mark Olympic Day on Thursday. (XinhuaLi Ming)
By Michael Place


RIO DE JANEIRO, July 4 (Xinhua) -- Tuesday will mark the start of the one-month countdown to the Rio 2016 Olympic Games as seven years of preparations reach their most critical juncture. Xinhua analyzes Rio's progress and identifies key challenges facing organizers ahead of the opening ceremony on August 5.


GAMES ORGANIZATION


Rio 2016 organizers have avoided many of the problems that beset the World Cup in Brazil two years ago, when most of the stadiums were running late amid huge budget overruns.


Last week city officials said that the construction of Rio's Olympic Park had reached 99% completion.


Five of the nine venues at the park are ready: Arena Carioca 1 (basketball), Arena Carioca 2 (judo Sokratis Papastathopoulos Jersey , wrestling), Arena Carioca 3 (taekwondo, fencing), Future Arena (handball) and the aquatic center (swimming). Work on the athletes' village, media facilities and the Olympic Park hotel has also been completed.


Despite the encouraging progress at most Olympic facilities Shinji Kagawa Jersey , not everything has gone to plan. Work is ongoing at the velodrome, a warmup pool at the Maria Lenk Aquatic center and two tennis courts.


City officials have said that the velodrome - the least advanced Rio 2016 venue - will be ready by mid-July, more than six months behind schedule.


POLITICAL CRISIS, RECESSION


In May, Brazil's senate voted to begin an impeachment trial against President Dilma Rousseff for her alleged manipulation of government accounts. A verdict is not expected to be given until after the Olympics Sergio Gomez Jersey , averting the threat of a major distraction from sport's showpiece event.


Political turbulence has coincided with a massive corruption scandal at state-run oil