重回3900点，继续加仓还是减仓？

Group 1 - The core viewpoint of the article highlights the fluctuating nature of the A-share market, with the Shanghai Composite Index breaking through 3900 points for the first time since August 2015, but failing to maintain its strength and experiencing significant pullbacks shortly after [1][5] - The article emphasizes the importance of investor sentiment and invites participation in a survey to gauge current market perceptions, which will aid in understanding market trends and providing better services to investors [1][5] - The sentiment survey aims to reveal underlying consensus and divergences in the market across four key dimensions: short-term expectations, behavioral signals, risk appetite, and profit-loss pressure [5]