题目选项分析

Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, which removes only selected trees, along with surface fires that burn down individual trees but do not denude the forest.

Past assessments of the Brazilian rain forest have used satellite images to tally deforested areas, where farmers and ranchers have clear-cut and burned all the trees, but such work has not addressed either logging, which removes only selected trees, or surface fires that burn down individual trees but do not denude the forest.