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] 【C8】

选项 A、will
B、can
C、must
D、may

答案 D

解析情态动词题。句意为：结果表明，双语者中可能表现出这种积极的连带效果，而这种效果在孩子和老人之中表现得尤为明显。根据前一句使用的情态动词would，特别是最后一段中指出，文中提到的发现都是抽象的(abstract)，并使用了情态动词may表示所述并非十分肯定的事实，故此处也应使用表示“有此可能”的情态动词，因此may为答案。其他各项均不符合上述分析，排除。

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