A-A+
According to the passage what attracts man's
问题详情
According to the passage, what attracts man"s greater attention？
A. Fly ash.
B. The construction of dams, bricks, and roads.
C. Extracting aluminum, silicon, and magnetic from ash.
D. The available technology.
参考答案
正确答案：A
答案为A。根据第一段最后一句，As a by-product of burned coal，fly ash requires no additional expenditure of energy to be produced，while cement production requires great amounts of energy作出该项选择。
