题目

在△ABC中，若|cosA﹣|+（1﹣tanB）2=0，则∠C的度数是（ ） A．  45°          B．60°          C．75°          D． 105° 答案：C             解：由题意，得 cosA=，tanB=1， ∴∠A=60°，∠B=45°， ∴∠C=180°﹣∠A﹣∠B=180°﹣60°﹣45°=75°．Volunteers WantedOur annual English Festival, which will be held on June 15-17, 2017, is now looking for 20 student volunteers to provide service for Talent Show, Speech Contest, and English Debate. If you are interested, please send an application email at your earliest convenience to Ms Chen at chenlaoshi@aef.com写作要点：1. 表明写作意图；2. 陈述应征目的；3. 说明应征条件（性格，能力等）。写作要求：1. 邮件词数不少于100字； 2. 开头和结尾部分已写好，不计入总词数；3. 可根据情节增加细节，使行文连贯； 4. 不能使用真实姓名和学校名称。Dear Ms Chen,I’m Li Hua, a student from Class 3, Senior 2. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Looking forward to your reply.Yours truly,Li Hua