Beijing Olympics Opening Ceremony singing girl was mimed
http://news.bbc.co.uk/2/hi/asia-pacific/7556058.stm
So, the cuter girl seen at the Beijing Olympic Opening Ceremony cannot sing. But the girl who was singing was uglier but had the perfect voice.

In the opening ceremony,
What about those children wearing ethnic group costumes supposedly representing the different ethnic groups of China?

http://www.telegraph.co.uk/sport/othersports/olympics/2561979/Beijing-Olympics-Ethnic-children-exposed-as-fakes-in-opening-ceremony.html
http://afp.google.com/article/ALeqM5ijm2i9qyr5mG6icgCv0gBqnpwx0g
http://www.reuters.com/article/GCA-Olympics/idUSSP2154320080815