2．________________________对......作出贡献；促成；导致

3．________________________取得重大突破

4．________________________可以接近的，可用的

5．________________________从......中受益

6．________________________上发条

7．________________________ 和......一起，随着；除......以外

8．________________________与......齐步前进

Ⅲ.重点句式

1．It is/was not until...that...

John Logie Baird constructed the first colour TV in 1928，but ________________________ the first colour TV programme was broadcast.

约翰·洛吉·贝尔德于1928年制造出第一台彩色电视机，但是直到1938年第一个彩色电视节目才播出。

2．It takes/took time for sb./sth. to do sth.

It __________________________，though，until 1951，______ regular colour TV broadcasts ______________ in the USA.

但是，直到1951年，彩色电视节目才得以在美国定期播出，其间经历了二十多年的时间。

3．with复合结构

Satellites allow TV to be broadcast live over vast distances，___________________________ at the same time.

卫星让远距离直播电视节目成为可能，大家在同一时间可以收到相同的电视节目。

4．过去分词短语作定语

In 1928，the first tape recorders __________________ were made in Germany.

1928年，第一批录制声音的磁带录音机在德国制造出来。

Ⅰ.课文阅读理解

1．According to the passage，what do the six subtitles show us?

A．The different stages of the development of video and sound devices.

B．The history of TV and audio devices.

C．The origin of video and sound devices.

D．Tape recorders and players.

2．How is the passage mainly organized?