Text A How Dictionaries Are Made本课主要单词1. mainly adv. 主要地；大部分地1）I don't know what his interests are， because we talk mainly about work when we meet...
5. Rising living costs are considered by almost everyone as a reason both for holding sales and for attending them本句中的rising可以看作为形容词，做定词，修饰其后的名词短语，如：r...
13. bargain n. 交易；特价商品v. 讨价还价1）I was sure it would be a losing bargain at the beginning.（我开始就认定这是一笔赔本买卖。）2）She showed me how to shop bargains. （她让我看看该...
Text A The Great American Garage Sale本课主要单词1. garage n. 车库，汽车修理厂1）Jim jumped out the car and opened the garage doors.（杰姆跃出车外，把车库门打开。）2）It is already 6...
8.In cases where the explanation is unknown the scientific point of view is that there is a reason if it can only be discovered句子中的where 是关系副词，引导定语从句，...
本课语言点1.Science had its beginning when man started asking questions about his environment.句中的beginning是一个名词，意思是开始、开端、” 例如：1）We had too much rain ...
10.solution n. 解决办法solve v. 解决1）The loan was only a temporary solution to the country's financial difficulties.（借贷只能暂时解决这个国家的经济困难。）2）After a day&#...
Text A scientific attitudes本课主要单词1.attitude n. 姿势，姿态；态度，看法1）The plane was in a nose-down attitude. （飞机处于俯冲姿态。）2）They decided to take an attitude of wa...
9. Still the classification into learned” and popular” is convenient and sound .本句中的sound是形容词，意思是正确的；明智的”，如：1）He felt so happy that ...
本课主要语言点1. In every cultivated language there are two great classes of words which， taken together， make up the whole vocabulary.class在本句中的意思是种类”...