盘前必读丨美股两连阴携程大跌17%；换房退个税政策延续实施

Group 1 - The overall market trend is considered healthy, with long-term capital providing a safety net against downside risks [1][13] - Major banks continue to experience sluggish performance, with Wells Fargo's Q4 revenue falling short of market expectations due to weak investment banking activities [3] - Citigroup reported a year-on-year decline in net profit for Q4, despite achieving revenue growth [3] Group 2 - The Nasdaq China Golden Dragon Index fell by 0.2%, with notable movements in individual stocks such as Alibaba rising by 1.7% and Ctrip plunging by 17.1% due to antitrust investigations [3][11] - The precious metals market saw significant gains, with COMEX gold futures rising by 0.81% to $4626.30 per ounce and silver futures increasing by 5.81% to $90.86 per ounce, both reaching historical highs [4] - The Chinese central bank announced a 900 billion yuan reverse repurchase operation to maintain liquidity in the banking system [10]