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engaging in a hobby like reading a book, making a patchwork quilt or even playing computer games can delay the onset of dementia a us study suggests.watching tv but does not count-and indeed spending significant periods of time in front of the box may speed up with memory loss, researchers found.(1)____(2)____ nearly 200 people aged 70 to 89 with mild memory problems were compared to a group who had no impairment.(3)____ the researchers from the mayo clinic in minnesota asked the volunteers about their daily activities within the past year and how mental active they had been between the age of 50 to 65.(4)____ those who had during middle age busy reading, playing games or engaging in craft hobbies like patch working or knitting was found to have a 40% reduced risk of memory impairment.(5)____(6)____ in later life, those same activities reduced the risk by between 30 and 50%. those who watched tv for less than 7 hours a day were als0 50% more likely to develop memory loss than those who spent longer than that staring at the screen．(7)____
"this s study is exciting because it demonstrates that age does not need to be a passive process," said study author and neuroscientist dr yonas geda.(9)____ "by simply engaging in cognitive exercise,you can protect against future memory loss.of course, the challenge with this type of research is what we are relying on past memories of the participants, therefore we need to conform these findings with additional research."(9)____(10)____
文章大意
本文讨论的是如何防治痴呆症。美国一项研究表明：从事一些业余爱好，如读书、缝制百衲被，甚至是玩电脑游戏，都能减缓痴呆症发病。不过研究者们发现，看电视起不到这一作用，在电视机前消磨大量时间反而可能加速失忆。这一研究证明衰老并不一定是被动的过程，只要进行认知性锻炼就能预防。
答案详解
1．buthowever词汇错误。此处but在主语watching tv和助动词does之间，显然是作插入语，but虽然表示转折，但but是连词，通常连接两个独立的句子，故此处应改为however，语意逻辑上表示转折，同时放在句中作插入语。
2．withwith词汇错误。speed up意为“加速”，若与with -起连用，则表示“与……一起加速”。此处memory loss是直接由“在电视前面花大量时间”引起的，并不表伴随，故删掉with。
3．towith词汇错误。compare to表示“把……比作，比喻”，此处意为“研究者把约200名70岁至89岁、有轻微失忆的老人和一组没有此症状的老人进行了对比”，表示“对比，比较”时应该用固定词组compare with。
4．mentalmentally语法错误，mental是形容词，不能用来修饰后面的形容词active，应该改为副词mentally，整句表示“研究者询问了参与调查的志愿者过去一年的日常活动，以及他们50岁到65岁之间头脑的活跃状况”。
5．∧ busybeen语法错误。busy是形容词，不能直接作谓语，be busy doing sth.是固定搭配，表示“忙于做……”，during middle age在句中作插入语，由于前面出现了助动词had，可以判断who引导的从句是过去完成时，因此在busy前加been。
6．waswere语法错误。本句主语是those，后面是who引导的定语从句，was作谓语则主谓不一致，故应改为复数形式were。
7．moreless语篇错误。本文在开头第二句就提到“看电视起不到这个作用（减缓痴呆症）”，而本句说“与看电视超过7小时的人比，看电视少于7小时的人失忆的可能性要高50%”，显然与开头提到的研究结果相悖，故应将more改为less，表示看电视少于7小时的人患失忆的可能性要低。
8．ageaging词汇错误。age表示“年龄，老年”，aging作名词表示“老年化，衰老”，由后面的process（过程）一词可以判断，此处并非强调年纪，而是指老年化这个过程，故用aging更符合文意。
9．whatthat语法错误。what后接的从句意为“我们依赖参与者对过往的记忆”，如果用what引导表语从句，what在句中应该充当某个成分，并且表示“什么”，但从句中不缺少任何成分，所以此处应改为that，在从句中无实际意思。
10．conformconfirm词汇错误。conform表示“遵守，符合”，con五rm表示“证实，证明”。本句是说“这类研究的挑战在于我们依赖参与者对过往的记忆，因此还需另外的研究来证明这些发现”，conform用在此处不符合句意，故改为confirm。