If there were no greenhouse effect on Earth,the average temperature of the Earth's surface would have been $.....P.....$ instead of $.....Q.....$.

  • A
    $15^{\circ}\,C \quad -18^{\circ}\,C$
  • B
    $18^{\circ}\,C \quad -15^{\circ}\,C$
  • C
    $25^{\circ}\,C \quad -18^{\circ}\,C$
  • D
    $18^{\circ}\,C \quad -25^{\circ}\,C$

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