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单选题

Fluid intelligence is the type of intelligence that has to do with short-term memory and the ability to think quickly, logically, and abstractly in order to solve new problems.It ( 1 ) in young adulthood, levels out for a period of time, and then ( 2 ) starts to slowly decline as we age. But ( 3 ) aging is inevitable, scientists are finding out that certain changes in brain function may not be.
One study found that muscle loss and the ( 4 ) of body fat around the abdomen are associated with a decline in fluid intelligence. This suggests the ( 5 ) that lifestyle factors might help prevent or ( 6 ) this type of decline.
The researchers looked at data that ( 7 ) measurements of lean muscle and abdominal fat from more than 4,000 middle-to-older-aged men and women and ( 8 ) that data to reported changes in fluid intelligence over a six-year period. They found that middle-aged people ( 9 ) higher measures of abdominal fat ( 10 ) worse on measures of fluid intelligence as the years ( 11 ) .
For women, the association may be ( 12 ) to changes in immunity that resulted from excess abdominal fat; in men, the immune system did not appear to be ( 13 ) . It is hoped that future studies could ( 14 ) these differences and perhaps lead to different ( 15 ) for men and women.
( 16 ) there are steps you can ( 17 ) to help reduce abdominal fat and maintain lean muscle mass as you age in order to protect both your physical and mental ( 18 ) The two highly recommended lifestyle approaches are maintaining or increasing your ( 19 ) of aerobic exercise and following Mediterranean-style ( 20 ) that is high in fiber and eliminates highly processed foods.

(3)

A
while
B
since
C
once
D
until
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答案:

A

解析:

[解题思路]空格句指出,一一一-衰老无可避免,科学家们发现大脑功能的某些变化或许并不是这样(并非不可避免)。利用句内情形对比"衰老无可避免vs大脑功能的某些变化可以避免“可推知句子前后为“让步—转折“逻辑,[A] while可用于从句之首,引出与主句内容相对比的信息,符合文意。 [错项排除][BJ since用于引出主句现象发生的原因,[C] once表示只要从句现象发生,主句现象就会随之发生(即用于引出主句现象发生的前提条件),而文中“衰老无可避免“显然不是“大脑功能的某些变化可以避免"的原因/前提条件,均可排除。CD] until用于引出主句所述持续状态最终结束的时刻,例: Until recently they were living in New York.(直到不久前他们还住在纽约。)而“直到衰老无可避免前,科学家发现大脑某些功能的变化可以避免=衰老无可避免后,科学家不再发现……“显然逻辑不通,D错误。
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