题目

如图，△ABC≌△DCB，∠A=80°，∠DBC=40°，则∠DCA的度数为（）A. 20° B. 25° C. 30° D. 35° 答案：【答案】A【解析】根据全等三角形的性质即可求解.∵△ABC≌△DCB，∠A=80°，∴∠D=∠A=80°，∠ACB=∠DBC=40°，∴∠DCB=180°-∠D-∠DBC=60°，∴∠DCA=∠DCB-∠ACB=20°，故选A.还原单词，完成句子 (deitr) I feel ________. I should go to bed early.