题目内容
16．The Healthy habits survey（调查） shows that only about one third of American seniors have correct habits．Here are some findings and expert advice．1．How many times did you brush your teeth yesterday？
Findings：A full 33% of seniors brush their teeth only once a day．
Step：Remove the 300 types of bacteria in your mouth each morning with a battery-operated toothbrush．Brush gently for 2 minutes，at least twice a day．
2．How many times did you wash your hands or bathe yesterday？
Findings：Seniors，on average，bathe fewer than 3 days a week．And nearly 30% wash their hands only 4 times a day---half of the number doctors recommend．
Step：We touch our faces around 3，000times a day---often with hot running water and soap for 20 seconds．
3．How often do you think about fighting germs（病菌）？
Findings：Seniors are not fighting germs as well as they should．
Step：Be aware of germs．Do you know it is not your toilet but your kitchen sponge （海绵） that can carry more germs than anything else？To kill these germs，keep your sponge in the microwave for 10 seconds．
29．What is found out about American seniors？D
A．Most of them have good habits．
B．Nearly 30% of them bathe three days a week．
C．All of them are fighting germs better than expected．
D．About one third of them brush their teeth only once a day．
30．Doctors suggest that people should wash their handsD．
A．twice a day
B．three times a day
C．four times a day
D．eight times a day
31．Which of the following is true according to the text？C
A．We should keep from touching our faces．
B．There are less than 300 types of bacteria in the mouth．
C．A kitchen sponge can carry more germs than a toilet．
D．We should wash our hands before touching a door handle．
分析 本文是关于健康习惯的调查．在一天刷几次牙，洗手沐浴几次，以及多久考虑过和细菌战斗一次等方面，描述了一些美国老年人的习惯并给出了专家建议．
解答 29．D．细节理解题．根据"A full 33% of seniors brush their teeth only once a day．"可知大约三分之一的美国老年人一天只刷一次牙，故选D．
30．D．细节理解题．根据"And nearly 30% wash their hands only 4 times a day----half of the number doctors recommend．"一天洗4次手是专家建议的一半，可知专家建议每天洗8次手．故答案选D．
31．C．细节理解题．根据"Do you know it is not your toilet but your kitchen sponge（海绵）that can carry more germs than anything else？"可知厨房里的海绵比任何其他东西（包括厕所）携带的细菌都多．所以C是正确的．
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．
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