单项选择题

Four thousand years ago______.

A.people began practicing civil engineering in order to become professional engineers
B.civil engineers began putting their knowledge into practice
C.there appeared civil engineers by profession
D.civil engineers got more involved in their profession
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单项选择题
Civil engineers of ancient times were intelligent enough to build entire cities, including______.
A.systems of pipes, bridges, and pyramids
B.pipeline systems, bridges and farmlands
C.water supply systems, bridges, and pipelines for cultivation
D.water supply systems, bridges and structures
单项选择题
From the passage we know that______.
A.building materials were broken into smaller pieces of all sizes
B.there were no requirements for the size and shape of building materials
C.Egyptian engineers were not concemod with the size and shape of the building materials
D.building materials were processed to meet certain requirements for their size and shape
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