阅读表达（共5小题，每小题2分，满分10分）
[1] The Canadian scientists say that getting older really does make one wiser.  The over-55s use their brains more efficiently (高效率地) than younger people, as they are much more likely to get rid of mistakes. Younger people, ________, give the impression of being sharper, simply by coming up with answers more quickly. But this may be a sign of inexperience rather than wisdom.
[2] According to their experiment on sorting words into pairs, scientists found surprising differences between the brains of the older and younger participants when they made a mistake. To the younger ones, the mistake immediately activated(激活) several different parts of the brain to help them decide what to do next. The older people, however, didn’t start thinking about what they were going to do until the game restarted.
[3] Dr Oury Monchi said, “When the young participants made a mistake and had to plan and take a new measure to get the right answer, various parts of their brains were used even before the next task began. However, when the older participants learned that they had a mistake, they decided to make adjustments(调整) only when completely necessary.   The older brain had experience and knew that nothing was gained by taking action too soon.”
[4] Dr Monchi compared the results to Aesop’s fable of the tortoise and the hare, saying, “Being able to run fast does not always win the race --you have to know how to best use your abilities.” This saying is a defining characteristic of ageing. It is as though the older brain is more unaffected to criticism and more confident than the young brain. Overall, the older group, who were aged between 55 and 75, took longer to complete the game but did roughly as well as those aged 18 to 35.
What’s the main idea of the passage? (no more than 8 words)
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Fill in the blank in Paragraph I with proper words. (no more than 4 words)
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What does the underlined word “they” in Paragraph 2 refer to? (no more than 6 words)
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what did the older participants do after they learned that they had made a mistake? (no more than 10 words)
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Complete the following statement with proper words according to Paragraph 4. (no more than 10 words)
____________________________________ are the two likely advantages of the older brain.