A、It has already been settled.B、It has caused much dispute.C、It is not as diff

游客2024-03-09 23

问题

选项 A、It has already been settled.
B、It has caused much dispute.
C、It is not as difficult as expected.
D、It is unlikely to be solved soon.

答案 A

解析该句中的they used…to crack the problem表明Greg Asner与其同事已解决了如何估算森林存储碳量的难题。因此，本题应选A。

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