Many kindhearted people ___________ the Disaster Relief Fund to help the people in the earthquakestricken area. A. devote to B. attend to C. contribute to D. lead to 答案:C在新农村建设过程中,某村计划建造一个室内矩形(ABCD)蔬菜温室.在温室内,沿左、右两侧与后侧内墙各保留1m宽的通道,沿前侧内墙保留3m宽的空地,内部(EFGH)种植蔬菜(示意图).(1)若矩形ABCD的周长为104m,要使EFGH的面积不小于504m2,试求边长AB的范围;(2)若矩形ABCD的面积为800m2,则当边长AB为多少时,矩形EFGH的面积S最大.