As an enterprise, even a state-owned monopoly enterprise must pursue profits. However, from the perspective of "buying at a high price and selling at a low price", China's oil policy clearly has serious flaws. "Buy" or "sell at a low price", its benefits are unscathed, and even get more from it. The only damage is the domestic economic and national interests. This text is mainly emphasized? ['The government should pay attention to the profitability of state-owned monopolies.', 'The state should feed subsidies to state-owned oil companies.', "China's oil policy has strategic shortcomings.", 'State-owned oil companies are profiting at the expense of national interests.']