1. Only half the collection of the Louvre is on display.
2. In addition to being a museum, the Louvre has also been a prison.
3. The present palace was built to display the royal art collections.
4. After the French Revolution, it became a public museum.
5. In 1989 I.M. Pei designed the glass pyramaid for a new entrance.
6. Pei's design actually has 673 panels.
7. The new entrance was required to handle the growing number of visitors.
Answer:
D. Northern Europe was controlled by tribes
