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 toss 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 diet that is high in fiber and eliminates highly（20） ____ foods. （1）A. fades B. peaks C. edges D. halts （2）A.universally B. alternatively C. tremendously D. suspiciously （3）A. once B. lest C. while D. since （4）A.accumulation B. acceleration C. consumption D. assumption （5）A. measurement B. principal C. decision D. potential （6）A. postpone B. undertake C. avoid D. evolve （7）A. supported B. included C. evaluated D. reinforced （8）A. dedicated B. applied C. combined D. compared （9）A. with B. above C. via D. against （10）A.negotiated B. managed C. scored D. played （11）A.went away B. counted on C.set off D. went by （12）A. parallel B.attributive C. similar D. corresponding （13）A.involved B. released C. replaced D. charged （14）A.collapse B.classify C. illustrate D. bridge （15）A. demands B. symptoms C. compensation D.treatments （16）A. Meanwhile B. Nonetheless C. Particularly D.Homogeneously （17）A. transform B. suggest C. take D. count （18）A. formation B. well-being C. image D. account （19）A. passion B. knowledge C. extension D. level （20）A. recycled B. preserved C. enveloped D. processed