Watching more than 3 hours of television a day doubles memory loss in older people, a new study of more than 3,000 adults suggests.  22  Scientists at University College London used memory and fluency tests on the same group of people 6 years apart. They found that those who watched on average less than 3 hours' television a day showed a decline of around 4 to 5 percent, while those who tended to watch more than 3 hours a day declined by an average of 8 to 10 percent.  23  The research team say they believe the “alert-but-passive” nature of television watching may be creating stress on the mind, which contributes to memory decline. Older people who watch more television are also less likely to undertake activities known to preserve mental functioning, such as reading, or interactive screen-based pursuits, such as using the Internet or playing video games.  24  The researchers say that television viewing may be a risk factor for Alzheimer's disease, but more research is needed to establish a link.  25  While watching television may have educational benefits and relaxation benefits, the researchers advise that adults over the age of 50 should try and ensure that television viewing is balanced with other contrasting activities. If you're concerned that the amount of television you're watching could have a negative impact on your health, you should limit the amount of TV you watch each day and undertake some healthy hobbies.

一项针对3000多名成年人的新研究表明，每天看电视超过3小时会使老年人的记忆力下降一倍。 22  英国伦敦大学学院的科学家对相隔6年的同一组人进行了记忆力和流利性测试。他们发现，那些平均每天看电视少于3小时的人呈现出大约4%到5%的下降，而那些倾向于每天看3小时以上的人平均下降了8%到10%。 23  研究小组称，他们认为看电视的“保持警觉但被动”的性质可能会给大脑造成压力，从而导致记忆力下降。 看电视时间较长的老年人也不太可能从事那些我们知道能够保持大脑功能的活动，例如阅读或基于屏幕的互动活动，像使用互联网或玩电子游戏。 24  研究人员表示，看电视可能是导致老年痴呆症的一个危险因素，但是需要更多的研究来确定两者的联系。  25  虽然看电视可能有教育和放松的好处，研究人员建议50岁以上的成年人应该尽量确保看电视与其他不同活动之间的平衡。如果你担心看电视时间过长会对你的健康产生负面影响，你应该限制每天看电视的时间并从事一些健康的爱好。

22.英国伦敦大学学院的科学家用什么方法测量记忆力丧失？

A)通过记录人们花费在看电视上的时间。

B)通过追踪人们的生活习惯。

C)通过进行记忆力和流利性测试。

D)通过扫描人们的大脑。

23.是什么导致了参与者的记忆力下降？

A)看几个小时的电视。

B)阅读书籍和杂志。

C)玩电子游戏。

D)上网冲浪。

24.对于看电视与老年痴呆症之间联系的研究成果，研究人员说了什么？

A)看电视可能是导致老年痴呆症的一个危险因素。

B)老年痴呆症患者往往每天看电视超过3小时。

C)有研究已经证实了它们之间的联系。

D)看电视对老年痴呆症患者有益。

25.研究人员建议老年人做什么？

A)每天看电视不超过3小时。

B)平衡看电视和其他不同的活动。

C)看一些有教育意义的电视节目。

D)多锻炼身体。