计算单位工程共程量时，强调按照既定的顺序进行。其目的是（）。
A. 便于制定材料采购计划
B. 便于有序安排施工进度
C. 避免因人而异，口径不同
D. 防止计算错误
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All of the following are mentioned in paragraph l as results of the trend toward installing contemporary art in public places in the United States EXCEPT（）
A. the transfer of artwork from private to public sites
B. artworks that represent a city's special character
C. greater interest in art by the American public
D. a broader understanding of the varieties of contemporary art
What is the passage mainly about（）
A. The influence of art on urban architecture in United States cities
B. The growth of public art in United States cities
C. The increase in public appreciation of art in the United States
D. The differences between public art in Europe and the United States
The word "exceptional" in line 2 is closest in meaning to（）
A. remarkable
B. fearless
C. expert
D. visible
According to the passage, why do ants use different compounds as trail pheromones（）
A. To reduce their sensitivity to some chemicals
B. To attract different types of ants
C. To protect their trail from other species
D. To indicate how far away the food is
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