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词组：
1. at the beginning of 2.means of
3. over long distance 4. by the middle of
5. such as 6. change into
7. from…to… 8. be capable of
9. not only…but… 10.in theory
11. have access to 12.amount of
13. provide…to… 14.follow sb's instructions
15. care for 16. as well as
17. at the same time 18. make…available
19. pay for 20.isolate…from…
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
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