高二英語下冊Unit10復(fù)習(xí)教案

　　 課時跟蹤講練

　　Section I 課前準(zhǔn)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(xué)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(dāng)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(jìn)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(shè)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。