Bilingual education is controversial in the United States.【C1】______, a grow

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问题 Bilingual education is controversial in the United States.【C1】______, a growing body of research shows that【C2】______ speaking two languages comes with certain types of improved mental【C3】______. Being able to use two languages and never knowing which one to be used right now is good to the brain. The attentional executive system, crucial for all higher thought, seems to be【C4】______.
Executive functioning allows us to keep a goal in mind, take【C5】______to achieve that goal, and to ignore other information that might【C6】______ us from that goal. The question is; Would it be the case that bilinguals, by the【C7】______need for controlling the two languages, develop a more efficient executive functioning system? The results suggest that bilinguals【C8】______ have this positive collateral effect, which is even stronger when it goes to kids and older people. These are ages【C9】______executive functioning is worse.
Bilinguals do better at tests that require multitasking, including ones that【C10】______ driving and talking on a phone. And the longer people have spoken multiple languages, the greater the cognitive【C11】______. There are even benefits when languages were【C12】______ at later ages.
Certainly, bilingualism comes - with some【C13】______. Bilinguals have more " tip-of-the-tongue" problems. There are a couple of milliseconds before they can target. Bilingual children, also, have【C14】______a smaller vocabulary in each of their languages than monolingual children,【C15】______ they probably know more words altogether.
Still, all of these findings are【C16】______ abstract. It is difficult to take laboratory findings showing better executive functioning in bilinguals and demonstrate that they【C17】______ into better performance in the workplace or some other practical【C18】______. The only real-world application preliminarily demonstrated may be that multilingualism can【C19】______health benefits to Alzheimer’s patients. Bilinguals show【C20】______ of the disease up to four years later than monolinguals. [br] 【C1】

选项 A、Hereafter
B、Therefore
C、However
D、Meanwhile

答案 C

解析副词辨析题。句意为：然而，越来越多的研究显示经常使用两种语言会改善某些脑部功能。解答本题需分析空格前后两句的逻辑关系。前句提出双语教育在美国是有争议的，而后句则提出了使用两种语言的优势，可见前后两句问是转折关系，故选用however。hereafter“此后”、meanwhile“同时”、therefore“因此”均不合文意。

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