[Stock Index Futures Opening in the Morning Session] The main contract of CSI 300 stock index futures (IF) fell 0.73%, the main contract of SSE 50 stock index futures (IH) fell 0.45%, the main contract of CSI 500 stock index futures (IC) fell 1.32%, and the main contract of CSI 1000 stock index futures (IM) fell 1.14%.