语法：

　　1.过去完成时

　　1)…both radio and television had be come established means of transmitting sounds and pictures.

　　2. 非限定性定语从句

　　1)…radio waves， which are then sent from a station on earth to an orbiting satellite.

　　2)…back to earth， where another station picks them up and changes them back into television signals.

　　3)The combination of satellites，which transmit information，computers，which store information，and television，which displays information，will change every home into an education and entertainment center.

　　2. 宾语从句

　　1)We must remember that technology alone is not the answer.

　　2)The satellite also demonstrated how it could provide help to people living in isolated areas…。

　　3. 注意such as，as well as，as的用法

　　1)In order to transmit an event such as the Olympics via satellite， …

　　2)…printed materials such as books and magazines.

　　3)…as well as get any information they need， …

　　4)As one telecommunication expert days， …

　　Text B What People Don't Know about Air

　　短语表达

　　1. without

　　We couldn't have finished the work so soon without your help.

　　2. adv. + past participle

　　It is widely known that the earth goes around the sun.

　　It is generally believed that the earth is getting hotter.

　　3. where

　　Where there is a will，there is a way.

　　4. be forced to

　　They were forced to work 14 hours a day.

　　5. shelter v.& n.

　　Mother tried to shelter her from the blow of the tragic news.

　　You have to find shelter from the blazing sun.

　　6. protect from

　　She had his umbrella to protect her from the sun.

　　7. deadly adj.

　　A drop of this poison might be deadly to man.

　　8. burst

　　As he braked a tire burst.

　　Everybody in the room burst out laughing.

　　The little girl burst into tears.

　　9. rest upon

　　His arm rested upon the table.

　　The task rested upon my shoulder.

　　His eyes rested upon a strange object.

　　10. gaze at

　　He was standing at the window， gazing at the street.

　　11. not…until

　　He didn't go out to play until he finished his homework.

　　12. in the meantime

　　13. pay attention to

　　Please pay more attention to your spelling next time.

　　14. add to

　　If you praise others more often， you can add great happiness to their life.

　　What he said just now added to my confusion.

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