A-A+
published from the University of California an
问题详情
published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has___
[A] defended
[B] concluded
[C] withdrawn
[D] advised
本题为单选题,请选出正确答案,谢谢!
参考答案
[B] concluded
【解析】从此题所在的句子的前后内容可以判断出,that is_______ 中的that是指第一句话的内容(朋友与我们基因上的相关性),很显然是研究得出的结论。因此,答案为concluded。