All the participants were European descendants.A、正确B、错误A原文说：They also noted th

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问题 All the participants were European descendants.

选项 A、正确
B、错误

答案 A

解析原文说：They also noted that the study only involved people whose ancestors were European．也就是说，所有研究对象都是欧洲人的后裔，因此，是正确的。

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