题目

阅读下面短文，在空白处写出各单词的正确形式，单词的第一个字母已给出。 Most adults find it hard to remember the things happened while they were children. Now scientists have found exactly when these memories d___51___.A new study has found that most three-year-old children can remember a lot of what happened to them a year e___52___,and these memories are still clear while they are 5 and 6, but by the time they are over 7, these memories become weaker r___53___. Most children by the age of 8 or 9 can only remember 35% of their e___54___ from under the age 一锤定音（用横线给下面画线的字选择正确的读音）。凑成（còuzòu）掠过（luèlüè）吹拂（fófú）俊俏（xiāoqiào）