At one time,tropical rainforests covered more than $..........$ of the earth's land surface,but now they do not cover more than $..........$.

  • A
    $14 \%, 6 \%$
  • B
    $21 \%, 14 \%$
  • C
    $14 \%, 3 \%$
  • D
    $21 \%, 3 \%$

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