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 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了人在不同的年齡階段有不同的壞習慣，并且這些習慣都是很難改掉的．
解答 21．D．細節(jié)理解題．根據(jù)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 可知現(xiàn)在我們有良好的習慣，如個人清潔，我們從母親的早期教育中受益；故答案為D．
22．D．推理判斷題．根據(jù)常識每個人或多或少都有一點壞習慣，所以說如果一個人說他沒有壞習慣，他就是在說謊；而在所有的這些壞習慣中，說謊是個最大的壞習慣．所以此題答案為D．
23．D．細節(jié)理解題．根據(jù)原文A、B、C 三項說法是正確的；根據(jù)原文第2段 In babyhood，it's thumb-sucking； in childhood，it's nail-biting 可知 D 項說法是錯誤的，所以此題答案為 D．
點評 考察學生的細節(jié)理解和推理判斷能力，做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進行合乎邏輯的推理判斷．
