14．Can you remember any of the bad habits you used to have when you were very young？Perhaps，as a baby，you used to suck your thumb（拇指）．Of course，you do not do that any more，but you can surely remember your mother's efforts to train you．The good habits you now have in such matters as personal cleanliness were part of this early training．
We may not suck our thumbs any more，but as we get older we get other bad habits．We can't give them up easily，either．（Anyone who has tried to give up smoking knows this very well!） Each period brings its own problems．In babyhood，it's thumb-sucking； in childhood，it's nail-biting； in our teens，i t's smoking； in middle age，it's over-eating，and so on．And if anyone tells you that he has no bad habits，you can be sure that he must have the worst habit of all．
21．According to the passage，now we have good habits such as personal cleanliness，for which we benefit fromD．
A．the social conditions
B．some strict rules
C．our friends'kind help
D．our mothers'early training
22．At the end of the story the writer says"And if anyone tells you that he has no bad habits，you can be sure that he must have the worst habit of all"．Here what do you suppose the worst habit is？
D
A．Reading．
B．Playing．
C．Walking．
D．Lying．
23．Which of the following is NOT true according to the passage？D
A．It is very difficult to get rid of our habits．
B．At different ages people have different bad habits．
C．Giving up smoking is as difficult as giving up other bad habits．
D．Sucking thumbs is a young child's bad habit．
分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了人在不同的年龄阶段有不同的坏习惯，并且这些习惯都是很难改掉的．
解答 21．D．细节理解题．根据第1段 …your mother's efforts to train you．The good habits you now have in such matters as personal cleanliness were part of this early training 可知现在我们有良好的习惯，如个人清洁，我们从母亲的早期教育中受益；故答案为D．
22．D．推理判断题．根据常识每个人或多或少都有一点坏习惯，所以说如果一个人说他没有坏习惯，他就是在说谎；而在所有的这些坏习惯中，说谎是个最大的坏习惯．所以此题答案为D．
23．D．细节理解题．根据原文A、B、C 三项说法是正确的；根据原文第2段 In babyhood，it's thumb-sucking； in childhood，it's nail-biting 可知 D 项说法是错误的，所以此题答案为 D．
点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
