Engaging in a hobby like reading a book, making a patchwork quilt or even playing computer games can delay the onset of dementi

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问题     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【M1】______
count—and indeed spending significant periods of time in front of
the box may speed up with memory loss, researchers found.【M2】______
Nearly 200 people aged 70 to 89 with mild memory problems were
compared to a group who had no impairment. The researchers【M3】______
from the Mayo Clinic in Minnesota asked the volunteers about
their daily activities within the past year and how mental active【M4】______
they had been between the age of 50 to 65. Those who had during
middle age busy reading, playing games or engaging in craft【M5】______
hobbies like patchworking or knitting was found to have a 40%【M6】______
reduced risk of memory impairment. 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 also 50% more likely【M7】______
to develop memory loss than those who spent longer than that
staring at the screen.
    "This study is exciting because it demonstrates that age does【M8】______
not need to be a passive process," said study author and
neuroscientist Dr Yonas Geda. "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【M9】______
past memories of the participants, therefore we need to conform【M10】______
these findings with additional research."
【M5】

选项

答案∧busy—been

解析 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。
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