BEIJING, May 31 (Xinhua) -- Chinese shares continued a downward adjustment on Thursday morning, with the benchmark Shanghai Composite Index opening at 4,006.28 points, down 46.81 points, or 1.15 percent.

    The tripling of the stamp tax on trading prompted the sharpest dive in three months on Wednesday.

    The index, which tracks both yuan-denominated A-shares and foreign currency-denominated B-shares listed on the Shanghai Stock Exchange, closed at 4,053.09 points on Wednesday.