A、has been decreased lately B、has been increased lately C、has been underestimated D、has been overestimated D最后一段第1句表明Markku Kann

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问题

选项 A、has been decreased lately
B、has been increased lately
C、has been underestimated
D、has been overestimated

答案D

解析 最后一段第1句表明Markku Kanninen认为碳汇数据有改善的必要,not precise说明碳汇数据一直以来不够准确,但到底数据是“过高”,还是“过低”呢?结合第1段首句就知道了,该句中的less…than we thought表明我们一直都高估了森林存储碳的能力。因此本题应选D,并排除C。
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