2. 外语
  3. 　　As people age, the brain changes in both good ways and bad. 　　If you are over 20, your cognitive performance is probably alrea

　　As people age, the brain changes in both good ways and bad. 　　If you are over 20, your cognitive performance is probably alrea

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问题 　　As people age, the brain changes in both good ways and bad.
　　If you are over 20, your cognitive performance is probably already
on the wane. The speed over which people can process information【S1】____________
declines at a steady rate from as early as their 20s.
　　A common test of processing speed is the "digit symbol substitution
test", in that a range of symbols are paired with a set of numbers in a【S2】____________
code. Participants are shown the code, given a row of symbols, then【S3】____________
asked to write down the corresponding number in the box below within
a set period. There is nothing cognitively challenging about the task;
levels of education do no difference to performance. But age does.【S4】____________
Speed consistently declines as people get older.
　　Fortunately, there is some good news to go with the bad.
Psychologists  distinguish "fluid intelligence", which is the ability【S5】____________
to solve new problems, and "crystallized intelligence", which roughly
equates to an individual’s stock of accumulating knowledge. 【S6】____________
　　These reserves of knowledge continue to increase with age:
people’s performance on vocabulary and general-knowledge tests
keeps improving into their 70s. Yet experience can often 【S7】____________
compensate for cognitive decline. In an old but instructive study
of typists ranging in the age from 19 to 72, older workers typed【S8】____________
just as fast as young ones, even though their   tapping   speed   was【S9】____________
slower. They achieved this   by looking further ahead in the text,
which allowed them to keep going smoothly.【S10】____________
【S5】
选项
答案^fluld—between
解析 介词缺失。谓语动词distinguish意为“区分，辨别”，其后跟了两个宾语fluid intelligence和crystallized intelligence。表示区分两者时，应使用短语distinguish between A and B，故在第一个宾语fluid intelligence之前增加介词between。
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