题目

下列关于物质性质的比较，不正确的是   A．酸性强弱：HIO4>HBrO4>HClO4     B．原子半径大小：Na>S>O   C．碱性强弱：KOH>NaOH>LiOH      D．金属性强弱：Na>Mg>Al  答案：A解析: ______ of the land in Jia Xing No. 1 Middle School _______ covered with trees and grassA.Two third, areB.Two thirds, areC.Two third, isD.Two thirds, is