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A、By using sAtEllitE imAgEs, mAps, Et
C、
B、By stuDying spECiFiC FArming mEthoDs.
C、By stuDying thE vAriAtion oF humAn populAtion.
D．By AnAlyzing thE quAlity oF Crops.

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根据网考网移动考试中心的统计，该试题：

81%的考友选择了A选项

14%的考友选择了B选项

4%的考友选择了C选项

1%的考友选择了D选项

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