This file photo shows the night view of Copacabana beach in Rio de Janeiro, Brazil on Oct. 6, 2013. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows a rower is seen at Ipanema beach in Rio de Janeiro, Brazil on Aug. 1, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows the night view of Rio de Janeiro, Brazil on Oct. 12, 2014. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

The combo photo taken in 2014 shows the statue of Christ the Redeemer illuminated with different colors of light in Rio de Janeiro, Brazil. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows a Christmas tree at Rodrigo de Freitas Lagoon in Rio de Janeiro, Brazil on Dec. 15, 2014. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

 This file photo shows the sunset view of the Rodrigo de Freitas lagoon and the Corcovado Mountain in Rio de Janeiro, Brazil on Jan. 29, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows the view of Guanabara Bay, in Rio de Janeiro, Brazil on April 28, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows the Botanical Garden in Rio de Janeiro, Brazil on Oct. 2, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows gliding enthusiasts flying with a delta wing from a platform located at the Pedra Bonita of Mountain Gavea in Rio de Janeiro, Brazil on Feb. 10, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian)

This file photo shows tourists walking in front of Lapa arch bridge in Rio de Janeiro, Brazil on April 25, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian) 10

This combination of two file photos shows views before and after sunset of Guanabara Bay and Botafogo neighborhood with Sugar Loaf mountain in the background in Rio de Janeiro, Brazil on Feb. 10, 2015. The Rio 2016 Olympic Games will be held from August 5 to 21. (Xinhua/Xu Zijian) 11