题目内容：

In one ancient Chinese story, there is a magic deer. She has beautiful nine-colored fur. The deer is kind and helps people who are sick and poor. In fact, this nine-colored deer comes from a painting in the Mogao Grottoes (莫高窟) in Dunhuang, Gansu.

The grottoes were created in AD 366. They hold the world’s best cave art. The clay figures (泥塑) and paintings on the wall are the Mogao Grotto’s greatest treasures. There are more than 2,000 colored clay figures in 492 caves. The tallest is 34.5 meters high while the smallest is only 2 cm, China Daily reported.

The most beautiful paintings are of dancing, flying fairies (飞天). They wear beautiful costumes. Among them, a fairy plays a pipa (琵琶) behind her back. This painting has given dancers in modern times lots of new ideas.

Besides the value of its art, the Mogao Grotto paintings also show how ancient people lived. Some show people farming, eating and fighting. Others show their wedding and funeral customs. In 1987 the Mogao Caves became a UNESCO World Heritage (遗产) Site.

Now it attracts visitors from all over the world. Visitors have to buy tickets online. This is to control the amount of tourists and better protect the site. If you want to visit the Mogao Grottoes, don’t forget to buy tickets online as soon as possible.

1.How many colored clay figures are there in each cave on average(平均)?

A. Over 4. B. About 492. C. About 2000. D. Over 366.

2.Why do visitors have to buy tickets online?

A. To enjoy the clay figures and paintings.

B. To experience how ancient people lived.

C. To obey the rules of controlling the amount of tourists and protecting the site.

D. To see how Maogao Grottoes became a UNESCO World Heritage Site.

3.Where might the passage be taken from?

A. A storybook. B. A tourist guide. C. A sports newspaper. D. A fashion magazine.