ACCORDING TO PARAGRAPH 1, THE ENVIRONMENTAL GOALS SET...

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.