Group 1 - The article discusses the "Three Exemptions and Three Reductions" tax policy for enterprises engaged in key public infrastructure projects, which allows for a three-year exemption from corporate income tax and a 50% reduction for the following three years [1][5]. - Eligible projects include ports, airports, railways, highways, urban public transport, electricity, and water conservancy, as specified in the "Public Infrastructure Project Corporate Income Tax Preferential Directory" [1][5]. - Enterprises must meet specific conditions, such as spatial independence of different construction batches and the ability of each batch to generate income [2][3]. Group 2 - The article outlines tax incentives for enterprises involved in environmental protection and energy-saving projects, which also receive a three-year exemption and a 50% reduction in corporate income tax for the subsequent three years [5][6]. - Eligible projects include public sewage treatment, public waste treatment, biogas utilization, energy-saving technology upgrades, and seawater desalination [5][6]. - If a project enjoying tax exemptions is transferred during the exemption period, the new owner can continue to benefit from the remaining tax incentives [6]. Group 3 - Tax incentives are available for qualified energy service companies implementing contract energy management projects, with similar tax benefits as outlined for other projects [7][8]. - The article also mentions tax exemptions for drinking water project management units, which receive the same tax benefits for new drinking water projects as other public infrastructure projects [9][10]. Group 4 - The article cites various legal documents that provide the basis for these tax policies, including the Corporate Income Tax Law of the People's Republic of China and relevant notices from the Ministry of Finance and the State Administration of Taxation [10].

Group 1 - The Sci-Tech Innovation 50 Index opened slightly lower on May 21, fluctuated throughout the day, and closed at 995.49 points, down 0.22% with a trading volume of approximately 17.38 billion yuan [1] - The overall performance of the Sci-Tech Innovation Board remains relatively active, with 29 stocks reaching new highs since 2025, 77 stocks hitting new highs in the last 30 trading days, and 89 stocks in the last 20 trading days [1] - On May 21, the average decline of 587 stocks on the Sci-Tech Innovation Board was 0.60%, with an average turnover rate of 2.11% and a total trading volume of 73.81 billion yuan [2] Group 2 - In terms of individual stock performance, Sangfor Technologies saw a significant increase of 19.99%, while Liyang Chip experienced a notable decline of 11.12% [3] - Semiconductor and environmental protection stocks had the largest declines, while the medical and healthcare sector showed mixed performance [2] - In terms of trading volume, SMIC had the highest trading volume at 1.675 billion yuan, while Yucheng Intelligent had the lowest at 365,570 yuan [4] Group 3 - Hanbang Technology had the highest turnover rate at 34.54%, while Longteng Optoelectronics had the lowest at 0.11% [5]

Core Points - The U.S. Environmental Protection Agency (EPA) plans to reduce its workforce to the lowest level since 1980 [1] - The agency will also cut its budget by $300 million [1] Group 1 - The workforce reduction indicates a significant shift in the agency's operational capacity and priorities [1] - The budget cut of $300 million reflects broader governmental fiscal constraints impacting environmental regulation and enforcement [1]