SHANGHAI — China stocks rebounded sharply on Thursday, snapping a savage five-day losing streak, as a rally on Wall Street brought some calm to shaky global markets. Local and foreign investors hunted for bargains after a more than 20 percent plunge in the country's major indexes over the past week. But traders said the market remained vulnerable to sudden selloffs, as investors who bought shares using margin financing continue to deleverage, and as China's economic outlook remains weak. The blue-chip CSI300 index jumped 6 percent to 3,205.64, while the Shanghai Composite Index gained 5.4 percent, to 3,083.59 points. Both indexes posted their biggest one-day percentage gains in nearly two months. “From today, I'm no longer pessimistic,” Jiang Chao, a strategist at Haitong Securities, who correctly predicted China's stellar bull run which ended in mid-June, wrote on Thursday. He predicted that China's central bank will cut interest rates further, which would make stocks attractive again, given the sharp drop in valuations during the recent crash. The Shanghai market currently trades at 14 times companies' earnings, compared with 22 at the market's peak in June. — Reuters