选修8unit5单词课件.ppt

因追溯是从现在算起指向过去，所以这个短语常用一般现在时， 也无被动语态。 date back to 追溯到；上溯到 The unearthed sword dates back to the Han Dynasty. This is an old building dating back to the 16th century. date back to = date from （时间往回推） （开始于） My interest in stamp collecting dates backs to/ dates from my schooldays. Thank You! * * * * * Unit 5 Meeting your ancestors ------words and expressions identify vt. 确认, 识别, 鉴别 identify sb/sth (as sb/ sth) 确认是… e.g. She was able to identify her attacker. She identified the man as her attacker. 2) identify A with B 认为某事物与另一事物等同 e.g. One can’t identify happiness with wealth. 幸福与财富不能混为一谈。 identify vt. 确认, 识别, 鉴别 n.鉴定 adj. 相同的 ID 身份证 identification identical identification card adj.可辨认的 identifiable 1) adj.供选择的；其他的 alternative energy 可替代能源 Do you have an alternative solution? alternative n.可能的选择；adj. 供选择的 an alternative to …的替代品 e.g. There are some alternatives to our plan. 2) n. [C] 二选其一；可供选择的东西；替代物 前有do, 后省to. alternative n.可能的选择；adj. 供选择的 I have no alternative but to fight. There is no alternative but to fight. 别无选择只好做… I have no alternative but to give up the plan. I have no choice but to give up the plan. I have nothing to do but give up the plan. I can do nothing but give up the plan. I can’t do anything but give up the plan. 拓展 Archaeology n.考古学 Archaeologist n. 考古学家 Archaeological adj. 考古学的 ----------我是化解画风不一蜜汁尴尬------------- --------------萌萌哒~~の分割线---------------- 1 starve 1 excavate 2 starvation 2 excavation 语境记忆 1 tentative adj. 试探性的 We have made a tentative agreement to meet on Friday. 2 accuracy n. 精确 _______ is the first thing. To get an _______ member, we must measure ________. accurately Accuracy accurate 3 acute adj. 敏锐的 He is an acute observer. There is an acute shortage of water. (严重的) 1) Sorry to interrupt you, but I have something to say. 2) Traffic in the city was interrupted by a snowstorm. 3) It is rude to interrupt. interrupt vt. vi. 打断…讲话；暂时中断或中止 Cut in / break in