单选

According to some environment

  • alist, the oil companies&n
  • bsp;     [A] are further polluting the air by using more oil than
  • clean energy.    [B] are not really concerne
  • d with solving the problem of pollution.    [C] are attempting to reduce the pollution they have done to the air.    [D] are in need of research and equipment in pollution prevention.     
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