The scientists carried out the research by using blood samples and saliva samples.

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问题 The scientists carried out the research by using blood samples and saliva samples.

选项 A、正确
B、错误

答案A

解析 原文说:They completed human genome examinations using blood samples from the UK Biobank and saliva samples from the U.S.-based ancestry company 23andMe.也就是说,科研人员采用了英国人的血液样本和美国人的唾液样本,因此,是正确的。
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