[Stock index futures opening in the morning] The main contract of CSI 300 Index Futures (IF) fell by 0.22%, the main contract of SSE 50 Index Futures (IH) fell by 0.29%, the main contract of CSI 500 Index Futures (IC) rose by 0.23%, and the main contract of CSI 1000 Index Futures (IM) rose by 0.49%.