题目

 Every evening after dinner, _____ tired from work, I will spend some time reading. A. unless                  B. if             C. until                  D. when 答案：A如图，已知MN是圆柱底面直径，NP是圆柱的高.在圆柱的侧面上，过点M、P嵌有一圈路径最短的金属丝.现将圆柱侧面沿NP剪开，所得的侧面展开图是