单项选择题

The history of civil engineering is a very important story in the development of civilization. Civil engineers began practicing their profession four thousand years ago.Every great civilization, Egyptians, Minoan, and Roman, for instance, had the civil engineers. What is left of their work is proof that they were intelligent. These engineers of the ancient world built entire cities. They de signed systems of pipes which supplied fresh water. They built water pipelines for farmlands as well as bridges of great length. The ruins of the structures tell us much about the work of early engineers.
Consider the pyramids of Egypt. They are evidence that some of the earliest engineers had great scientific ability. They are also proof that those engineers could make lasting works of art and des(gm Although they lived thousands of years ago,the Egyptian engineers used very exact measurements. The base of the largest pyramid, the great pyramid near Gizeh,comes to within inches of being a perfect square, the pyramid is perfectly placed. Each corner points toward the exact directions of north, south, east and west. The inside of the pyramid is filled with complicated passages and tunnels. These lead to different rooms inside the pyramid. Many of these passages are of great length and height.
The engineers of Egypt did more than design the pyramids. They also set up methods of moving and shaping the building materials.These were very heavy. They had to be brought from miles away and sometimes lifted several hundred feet. During the work, the engineers commanded thousands of workers. The pyramids remained as evidence of the abilities of the ancient Egyptian engineers.

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