According to the passage, what attracts man's greater attention? -题库考试答案搜索网

According to the passage, what attracts man's greater attention?

单选题

2022-01-01 12:09

A、Fly ash.
B、The construction of dams, bricks, and roads.
C、Extracting aluminum, silicon, and magnetic from ash.
D、The available technology.

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试题解析

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。

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