单选

It can be concluded that__________. 查看材料

  • A.raising the world" s temperature only a few degrees would not do much harm to life on earth
  • B.lowering the world" s temperature merely a few degrees would lead many major farming areas to disaster
  • C.almost no temperature variations have occurred over the past decade
  • D.the world" s temperature will remain constant in the years to come
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