2. 外语
  3. Any brain exercise is better than being a total mental couch potato. But the activities with the most 【C1】______are those that r

Any brain exercise is better than being a total mental couch potato. But the activities with the most 【C1】______are those that r

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问题     Any brain exercise is better than being a total mental couch potato. But the activities with the most 【C1】______are those that require you to work beyond what is easy and comfortable. Playing【C2】______rounds of games and watching the latest documentary marathon on the History Channel may not be enough. Just as your muscles grow stronger with use, mental exercise keeps your mental skills and memory in tone. But what kind of exercise is best for the brain? Here are some suggestions.
    Be a lifelong learner. Continuing to learn new things can build and【C3】______the connections between brain cells.
   【C4】______your brain. Think of all mental activities as a continuous whole. Watching a TV documentary would be on the passive, mildly challenging end of the【C5】______while learning how to converse in a new language would be on the active, very challenging end. When it comes to cognitive reserve,【C6】______challenging tasks have the biggest impact.
    Get uncomfortable. One stereotype of aging is that young people are bold explorers but older people are【C7】______homebodies who "know what they like." Getting out of your comfort zone from time to time challenges your mental skills. An example of this would be traveling to a city that you haven’t been to before, which forces you to【C8】______unfamiliar surroundings.
    Be social. Social【C9】______aging researchers have discovered, puts people at risk of losing some of the brain reserves they have built up over a lifetime. There are many ways to be social. One good way is working as a volunteer in a social setting, which allows you to have contact with【C10】______types of people and puts you in new situations.
    A)endless B)isolation C)maintain D)spectrum
    E)evidently F)navigate G)timid H)frantic
    I)mentally J)diverse K)impact L)deprive
    M)alternative N)excursion O)strain
【C4】
选项
答案O
解析 空格在句子的开头，后接your brain，故应填入动词，构成祈使句。根据该段其他句子的陈述可知，作者认为训练脑力的活动越具挑战性，对大脑就越有益，可见空格所在句应该是建议对大脑“严加训练”。动词库中strain一词最合适，strain your brain原意为“用尽脑筋”，此处指建议做一些要用脑力的事。
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