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 is the removal of only selected trees, as well as surface fires, burning down individual trees but do not denude the forest.
B感觉没有D的结构来的对称...不懂..NN指点
明白了...就是but前后的对称....
但仍然感觉B的两部分的从局不对称..一个是WHICH..一个是THAT
我觉得是这样:
如果选D,后面的but do not denude the forest就与burning不一致了,
所以选B that burn
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