Câu 9: According to paragraph 1, the environmental goals set by green builders were initially
considered unrealistic presumably because _______?
A. there was a lack of green builders at the beginning of the 20
th century.
B. the potential applications of technology to constructing green buildings were not recognised then
C. there was an abundance of natural materials for the construction of conventional buildings.
D. the problems of environment destruction were not prevalent at the time.
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