补全对话
International tourism is becoming interestingly popular, and large numbers of people from all over the world come to visit famous places such as the Great Wall of China and the Sistine Chapel in the Vatican. They've thrown rubbish everywhere, brought more traffic and even done serious damage to ancient relics.
As for the damage, there are many different causes. For example, the paintings in the Sistine Chapel are being damaged by people breathing onto them when they visit. That may raise the humidity (湿气) of the air and damage the paintings. Damage in other places such as the Great Wall is because of tourists climbing on delicate (脆弱的) areas. Besides, roads have also been built to help visitors climb the Wall easily. These activities can cause a lot of damage to the area.
Firstly, we have to cut down tourist numbers, because fewer visitors will result in less damage. Secondly, we should make strict rules about which areas people can visit and what they can do when they get there. People will not be allowed to walk off the paths. Visitors to indoor places can be asked to wear masks to protect the paintings.
In short, it is necessary to control tourism at famous places. And people who live hundreds of years later will have no chance to see these great places.
A. For example, special paths can be built.
B. What can we do to deal with these problems?
C. The Great Wall was built over 2,000 years ago.
D. However, these visitors have caused many problems.
E. Traveling is the best way for us to get to know the world.
F. If we do not do this, these places will disappear from our planet.
G. Their breath contains very small drops of water that are present in the air.