Group 1 - The A-share market saw a comprehensive decline on August 1, with the Guozheng Oil and Gas Index closing down by 1.36% at 1648.41 points and a trading volume of 10.799 billion yuan [1] - The Guozheng Oil and Gas Index reflects the price changes of listed companies in the oil and gas industry on the Shanghai and Shenzhen stock exchanges, with a base date of December 30, 2014, set at 1000.0 points [1] - The top ten weighted companies in the Guozheng Oil and Gas Index include Sinopec (15.38%), PetroChina (15.15%), CNOOC (12.76%), and others [1] Group 2 - The Guozheng Oil and Gas Index has shown a return of 1.64% over the past month, 6.72% over the past three months, but has declined by 4.43% year-to-date [2]