答案解析：
36. valuable
解析：此处需要形容词修饰practice，注意value需要去掉e再加able。
37. muscles
解析：此处需要与eyes，brain并列的名词，注意不要漏掉c和词尾的s。
38. information
解析：根据this，此处需要单数名词，注意or。
39. complicated
解析：此处需要形容词修饰chain，注意词尾的ed。
40. especially
解析：此处需要副词修饰useful，表示“特别”，注意开头的e、中间的c，并且要双写l。
41. character
解析：此处需要名词，注意ch和er。
42. virtues
解析：根据such...as，此处需要复数名词，概括unselfishness，courage，意为“美德”。注意ir和ue。
43. discipline
解析：此处需要与unselfishness，courage和love并列的单数名词。通过disc+ip+line记忆此词会效果更佳、记得更牢。
44. 标准答案：but what is learned in books cannot have the same deep effect on a child's character as what is learned by experience
听音关键：learned in books，not same，effect，character，learned by experience
答案重构：but what a child learns in books cannot have the same deep effect on his/her character as what he/she learns by experience
画龙点睛：注意比较结构和否定意义。
45. 标准答案：that really prepares them to take their place in society as citizens when they grow up
听音关键：prepare，take their place，as citizens
答案重构：that really prepares them for their place in society as grown-up citizens
画龙点睛：注意prepare sb. to do sth.结构，可替换为prepare sb. for sth.。
46. 标准答案：he will later find it natural to work for the good of his country instead of only for his own benefit
听音关键：natural，work for country，not own benefit
答案重构：later he will naturally work for the good of his country, not just for his own benefit
画龙点睛：注意对比结构，其中强调的是前者。