18．
The Great Wall of China was built over a period of 2，000 years，ending in the Ming Dynasty of the 17
th century．It stands as one of th ewonders of the world and it's great pride for China．
The Great Wall of China is about 5，500 miles long and passes through 10 Chinese provinces．At first，it was built to keep out the Mongols and other invading tribes（入侵部落）from the north．As time goes by，less than half of it remains standing and thousands of visitors climb up the wall every year．
More than 400 worldl eaders have visited the Great Wall in the past decades（几十年），including Queen Elizabeth，Margaret Thatcher，Nelson Mandela and US presidents Richard Nixon，Ronald Reagan and George H•W•Bush．
Many people thinkthat the Great Wall of China is the onlyman-made object which can be seen from space．In fact，NASA（美国宇航局） says that the wall is very difficult to seefrom orbit，even under good conditions．
57．The Chinese people finished building the Great WallB．
A．in the Tang Dynasty
B．inthe 17
th century
C．before the 17
th century
D．2000years ago
58．How many provinces does the Great Wall pass through in the passage？A
A．10
B．17
C．8
D．5
59．The Great Wall of China was built toCat first．
A．make the country beautiful
B．attract thousands of visitors
C．keep the country safe
D．become a road leading to other countries
60．Whichof the following is NOT mentioned about the Great Wall？D
A．It's about 5，500 miles long．
B．Three American presidents have visited it．
C．It is one of the wonders of the world．
D．Thousands of people died when it was built．
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