题目

         of the land in that district is covered with trees and grass．         A．Fifth-two          B．Two-fifth         C．Fifth-second        D．Two-fifths 答案：D直线y= x经过第________象限，经过点（1，________），y随x增大而________；直线y=-（a2+1）x经过第________象限，y随x增大而________.