TheHealthyHabitsSurvey(调查)showsthatonlyaboutonethirdofA...

问题详情：

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.

21. What is found out about American seniors?

   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.

22. Doctors suggest that people should wash their hands ______.

   A. twice a day     B. three times a day        C. four times a day          D. eight times a day

23. Which of the following is TRUE according to the text?

   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.

【回答】

DDC

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