39. It is hard to determine whether people who are free from dementia tend to have more social activities, or more social activities keep people away from dementia.
（本题出自2023年12月六级真题卷三）
答案&解析：
39.答案解析K。
由题干关键信息social activities和dementia定位到K段最后一句。定位句指出，我们真的不能断言到底是社交活动能预防痴呆症的发作，还是没有痴呆症的人更有可能在社交方面活跃。题干是对原文的同义转述。题干中的It is hard to determine对应原文中的we can't really say;题干中的people who are freefrom dementia对应原文中的people who don't have dementia;题干中的keep people away from dementia是对原文中的prevents the onset of dementia的同义转述。
↓↓↓↓↓↓↓ 点击下图：获历年真题↓↓↓↓↓↓↓
