1. The average height of the walls is ................ meters.

3 to 4

6 to 7

5 to 9

8 to 9

2. 41.8 million foreigners visited the Great Wall of China in ............... .

2010

2004

2005

2009

3. It got its official name “Great Wall of China” in the ............. century.

19th

17th

18th

12th

4. The construction of the Wall officially finished in ................ .

1986

1789

1644

1856

5. The average width is .............. meters.

98

65

75

93

6. The Great Wall is about .............. years old.

1,500

2,700

1000

300