What can be extracted from fine-powder fly ash?
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.
正确答案：A
答案为A根据第二段第一句Inadditiontousingflyashasaconcreteadditivethetechnologyisavailabletoextractthemainmineralcomponents-aluminumsiliconandmagnetic作出该项选择
