How does a place become a World Heritage Site ( 世 界 遗 产 )？ It takes a lot of people to decide.

How does a place become a World Heritage Site  ( 世 界 遗 产 )？ It takes a lot of people to decide.
1) If a country wants one of its places to be on the World Heritage List, it has to ask JUESCO (联合国教科文组织).The place must be important and special. UNESCO put the Great Wall on the list in 1987 because it said it was great part of Chinese culture and beautifully made to go with the land. When a country asks, it must also make a plan for taking care of the place.
2) The World Heritage committee of UNESCO talks about different places and decides whether to put them on the list. The committee meet every June. Many experts help the committee to decide.
3) After a new place goes on the list, UNESCO gives money to help keep it looking good. If a place is in serious danger, it may be put on the List of World Heritage Sites in Danger. UNESCO gives special care and help to those places.
4) Countries have to give UNESCO regular reports about places on the list. If UNESCO thinks a country isn't taking good care of a place, the site will be taken off the list.
19. When did the Great Wall became a World Heritage Site?
A 1987 B. 1988 C. 1997 D. 1977
20. The passage mainly discusses ______.
A. what the World Heritage Committee of UNESCO is
B. how the World Heritage Committee of UNESCO protects a World Heritage Site
C. how the Great Wall becomes a World Heritage Site
D. how a place becomes a World Heritage Site