单项选择题
For any numbers a, b, and c, For which of the following equations is it true that there is exactly one positive integer that satisfies it’()
A. none B. Ⅰ only C. Ⅲ only D. Ⅰ and Ⅲ only E. Ⅰ, Ⅱ, and Ⅲ
A. a preoccupation with style over design practicality B. the inefficiencies of installing plantings to a building’s roof C. how green roofs lead to more efficient and less-stressed home systems D. the increased public interest in environmental friendliness in the construction industry E. how global warming has accelerated society’s interest in environmentally friendly structures