高二英語下冊Unit10復習教案

　　 課時跟蹤講練

　　Section I 課前準備、聽力、口語

　　1. How does nature form a danger to people in the world and how can science help reduce that threat. 大自然是怎樣對全世界人民形成一種威脅的及科學能如何幫助減少這種威脅。( p.73 Warming Up No.3)

　　1) danger此處用作可數(shù)名詞，意為“危害，威脅”，常與介詞to或of連用。如：① The narrow bridge is a danger to traffic. 這座狹窄的橋梁對交通造成了危險。② Violent criminals like that are a danger to society. 這種犯罪嫌疑人對社會是一種危害。③ A busy street is a danger to children. 交通流量大的街道對小孩子很危險。

　　【鏈接】像danger一樣，還有些抽象名詞可表示具體化的事物。如：surprise，cold，pleasure，pity，failure，success， worry，honour， experience，must，difficulty，youth，beauty，wonder，interest等；但也有些抽象名詞即使沒有形容詞修飾也不能具體化，如：fun，advice，information，health，progress，wealth，news，weather等。如：① The experiment has turned out a success. 實驗終于成功了。② Many people agree that a knowledge of English is a must in international trade today. 許多人贊成當今國際貿(mào)易中英語知識是不可缺少的東西。

　　2) reduce此處用作及物動詞，意為“把 (數(shù)量、力量等)減少；縮小(尺寸、程度等)；降低(價格等)”，如：① I bought this shirt because it was reduced from $12 to $6. 我買了這件襯衣，因為它的價格從12英鎊減到6英鎊。 ② She reduced her weight by 5 kilograms. 她的體重減輕了5公斤。③ Reduce the sauce by boiling it for ten minutes. 煮十分鐘把調(diào)味汁熬掉些。④ The new working method further reduced production costs. 新的操作方法進一步降低了生產(chǎn)成本。

　　【拓展】reduce還可意為“使成為(多用于被動語態(tài)且與to連用)；使處于某種狀態(tài)(須與to連用)”。如：① The bomb reduced the city to ruins. 炸彈使得該城鎮(zhèn)化為廢墟。② The house was reduced to ashes. 房子被燒成了灰燼。③ He managed to reduced the group of children to silence. 他設法使這些孩子靜了下來。④In the old society he was reduced to begging. 在舊社會他被逼得討飯。