题目

如图所示，河堤横断面迎水坡AB的坡比是1： ， 堤高BC=5m，则坡面AB的长度是（ ） A . 10m B . 10m C . 15m D . 5m 答案：AMuch attention should ______ the environment and fighting against pollution.A．be paid to protectB．pay to protectingC．pay to protectD．be paid to protecting