Any brain exercise is better than being a total mental couch potato. But the

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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 [br] 【C9】

选项

答案 B

解析空格是句子的主语，且在形容词social之后，故应填入名词。句中的puts people at risk提示主语部分应为表示消极含义的词汇。名词库中isolation和strain都带有消极含义，结合本段中心意思be social(要合群)排除strain一词。isolation为本题答案。

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