The history of civil engineering is a very important story in the development of civilization. Civil engineers began practicing

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问题     The history of civil engineering is a very important story in the development of civilization. Civil engineers began practicing their【S1】______four thousand years ago. Every great civilization, Egyptian, Minoan, and Roman,【S2】______, had their civil engineers. What is left of their work is proof that they were intelligent. These engineers of the ancient world built entire cities. They【S3】______systems of pipes which supplied fresh water. They built water pipelines for farm lands as well as bridges of great length. The ruins of their structures tell us【S4】______about the work of early engineers.
    Consider the pyramids of Egypt. They are【S5】______that some of the earliest engineers had great scientific ability. They are also proof that those engineers could make lasting works of art and design. Although they lived thousands of years ago, the Egyptian engineers used very【S6】______measurements. The base of the largest pyramid -- the great pyramid near Gizeh -- comes to within inches of being a perfect square, the pyramid is【S7】______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【S8】______length and height.
    The engineers of Egypt did more than design the pyramids. They【S9】______set up methods of moving and shaping the building materials. These were very heavy. They had to be brought from miles【S10】______and sometimes lifted several hundred feet. During the work the engineers commanded thousands of workers. The pyramids remain as evidence of the abilities of the ancient Egyptian engineers.

A)away                                               I)great
B)many                                               J)tourists
C)also                                               K)evidence
D)profession                                         L)fact
E)perfectly                                          M)much
F)however                                            N)still
G)exact                                              O)designed
H)for instance
【S3】

选项

答案O

解析 所缺成分是该句的谓语,故应该从动词中斟选。此外,从意思上来看,该词应该与systems 构成动宾词组。据此,我们可以确定designed 为该题答案。design systems在上下文中的意思是“设计供水系统”。
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