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The Great Wall of China
Have you ever been to the Great Wall? The Great Wall of China is the longest wall in the world. It runs across north China like a huge dragon(巨龙). It is about 6,000 kilometers long, 7 meters high and 5 meters wide. In most places it is wide enough for five horses or ten men to walk side by side along the top.
The Great Wall was built more than twenty centuries(世纪) ago. It was difficult to build such a great wall without any modern machines(现代化机器). All the work had to be done by hand. It is very famous in the world. Many foreigners come to visit it every year.
1．The Great Wall is the ______ wall in the world. ( )| A．largest | B．longest | C．smallest |
| A．about 3,000 | B．about 6,000 | C．about 5,000 |
| A．seven | B．five | C．six |
| A．More than 20 centuries ago. | B．20 years ago. | C．We don’t know. |
| A．We don’t know. | B．Yes. | C．No. |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
