Should the Olympics in China be boycotted? why?

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i saw the vote in CNN.com, my friend told me the notice, i'm chinese, i'm so confused when i see the result of the vote: 55% say "yes", 45% say "No", i don't understand, why so many people think the olympics in China shoud be boycotted? what's wrong? And what do you think mylot friends? if you say "YES", what's your reason? i just want the truth, the truth of Chinese impression and opinions in Americans. thanks.