Getting rid of dirt, in the opinion of most people, is a good thing. However, the attitudes to dirt are always changing.
In the early 16th century, people thought that dirt on the skin was a means to block out disease, and washing off dirt with hot water could open up the skin and let ills in. A particular danger was thought to lie in public baths. By 1538, the French king had closed the bath houses in his kingdom. So did the king of England in 1546. Thus began a long time when the rich and the poor in Europe lived with dirt in a friendly way. Henry IV, King of France, was famously dirty. Upon learning that a nobleman had taken a bath, the king ordered that, to avoid the attack of disease, the nobleman should not go out.
Though the belief above was longlived, dirt has no longer been regarded as a nice neighbor ever since the 18th century. Scientifically speaking, cleaning away dirt is good to health. Clean water supply and hand washing are practical means of preventing disease. Yet, it seems that standards of cleanliness have moved beyond science since World War Ⅱ.Advertisements repeatedly sell the idea; clothes need to be whiter than white, cloths ever softer, surfaces to shine. Has the hate for dirt, however, gone too far?
Attitudes to dirt still differ hugely nowadays. Many firsttime 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.
The kings of France and England in the 16th century closed bath houses because ________.

A．they believed disease could be spread in public baths

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

C．they lived healthily in a dirty environment

D．they considered bathing as the cause of skin disease

Which of the following best describes Henry IV's attitude to bathing?

A．Approving.

B．Afraid.

C．Curious.

D．Uninterested.

How does the passage mainly develop?

A．By providing examples.

B．By making comparisons.

C．By following the order of importance.

D．By following the order of time.

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 present the change of views on dirt.

D．To call attention to the danger of dirt.