Attitudes to dirt still differ hugely nowadays. Many first-time parents nervously try to warn their children off touching dirt, which might be responsible for the spread of disease.On the contrary, Mary Ruebush, an American immunologist(免疫学家)，encourages children to play in the dirt to build up a strong immune system. And the latter position is gaining some ground.

　　38.The kings of France and England in the 16th century closed bath houses because

　　.

　　A. they lived healthily in a dirty environment.

　　B. they believed disease could be spread in public baths

　　C. they thought bath houses were too dirty to stay in

　　D. they considered bathing as the cause of skin disease

　　39.Which of the following best describes Henry IV’s attitude to bathing?

　　A. Approving.

　　B. Afraid..

　　C. Curious

　　D. Uninterested.

　　40.How does the passage mainly develop?

　　A. By providing examples.

　　B. By making comparisons.

　　C. By following the order of time.

　　D. By following the order of importance.

　　41.What is the author’s purpose in writing the passage?

　　A. To stress the role of dirt.

　　B. To introduce the history of dirt.

　　C. To call attention to the danger of dirt.

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