题目

如图，△ABC中，AD是BC边上的高，AE、BF分别是∠BAC、∠ABC的平分线，∠BAC=50°，∠ABC=60°，则∠EAD+∠ACD=（ ）A. 75° B. 80° C. 85° D. 90° 答案：【答案】A【解析】依据AD是BC边上的高，∠ABC=60°，即可得到∠BAD=30°，依据∠BAC=50°，AE平分∠BAC，即可得到∠DAE=5°，再根据△ABC中，∠C=180°﹣∠ABC﹣∠BAC=70°，可得∠EAD+∠ACD=75°．∵AD是BC边上的高，∠ABC=60°，∴∠BAD=30°，∵∠BAC=50°，AE平分∠BAC，∴∠BAE=25°，∴∠DAE=30°﹣25°=5°，∵△ABC中，∠C=180° 第II卷（写作，共40分） 第一节 单词拼写（共10小题；满分10分） 根据下列句子及所给首字母，写出空缺处各单词的正确形式。 81. There has been some progress in saving e_______ wildlife in China. 82. If their habitat is threatened or they cannot find enough food, their numbers may d_______. 83. In a way it was a r_______ to know that the children all arrived home safe. 84. He was so wild with joy that he could hardly c_______ his excitement. 85. Have you ever wanted to be part of a band as a famous singer or m_______? 86. What must be done if wildlife protection is to s_______. 87. The building is regularly i_______ by the fire-safety officer. 88. His d_______ to the cause of peace is well-known. 89. Sometimes these musicians may play to p_______ in the street or subway so that they can earn some extra money for themselves. 90. They were so popular that their fans formed clubs in order to get more f_______ with them.