By Zhang Shidong and Xiaowei Li
June 5 -- China's stocks fell, extending a slide that's wiped out more than $500 billion of market value since the government tripled the tax on securities trading on May 30.
Air China Ltd., the country's biggest airline, and Shanghai International Port (Group) Co., the operator of China's busiest port, were among some 100 stocks on the benchmark that tumbled by the 10 percent daily limit
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