From early times, man has been interested in art. People have often worked together to collect and save the world’s art treasures.
Fine art treasures from many countries are kept in an art museum called the Louvre (卢浮宫) in Paris, France. The works of art have been collected by the people of France over many centuries.
The Louvre has not always been a museum. The first building was a fort (要塞)with high walls and a round tower. It had a moat (护城河) to keep out the enemies. Over the years, the number of buildings around the fort grew. By 1350,the fort was no longer needed and became a palace home for French kings and queens.
During times of peace, new treasures were brought in. During times of war, many treasures were stolen, and the buildings were damaged(毁损).
When Francis I became King of France in the year of 1515,he brought in artists from many countries, and one of them was Leonardo da Vinci from Italy, whose Mona Lisa is the best-known painting in the museum today.
In 1793, the Louvre became a public museum, just as it is now. It is a place where art treasures have been saved for everyone to enjoy.
The above passage is about       

A．the world-famous painting Mona Lisa

B．a king of France by the name of Francis I

C．a grand art museum in the capital of France

D．an artist named Leonardo da Vinci

It seems to be necessary for great art works to be kept in public museum because    .

A．only in this way will they not be stolen

B．it gives everyone a chance to enjoy them

C．it helps people to remember the life of French kings and queens

D．it tells people what meaningful work the French kings did in the past

The Louver became an art museum        

A．in the year of 1350

B．in 1515 when Francis I became King of France

C．in the seventeenth century

D．in the nineties of the eighteenth century

Though the story does not say so, it makes you think        

A．lots of people pay visits to the Louvre

B．Leonardo da Vinci was once the keeper of the museum

C．the Louvre was only open to the artists from other countries

D．the Louvre became a public museum at the beginning of the last century