Television, the modern wonder of electronics, brings the world into your own home in sight and sound. And the word ’ television’

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问题 Television, the modern wonder of electronics, brings the world into your own home in sight and sound. And the word ’ television’ means seeing far.
Television works in much the same way as radio. In radio, sound is changed into electro-magn - etic waves which are sent through the air. Experiments leading to modern television took place more than a hundred years ago, By the 1920s inventors and researchers had turned the early theories into working models. Yet it took another thirty years for TV to become industry.
The influence of TV on the life of the people is incalculable; it can influence their thoughts and their way of life. It can also add to their store of knowledge. Educational TV stations teaching in various subjects. Some hospitals use TV for medical students to get close - up views of operations. At first television programs were broadcaster in black - and - white. With the devel-opm - ent of science and technology, the problem of how to telecast them in full color was solved and by the middle 1960s the national networks were broadcasting most of their programs in color.
The programs that people watch are not only local and national ones, since the launching of the first communications satellite, more and more programs are telecast ’ live’ from all over the world. People in San Francisco were able to watch the 1964 Olympic in Tokyo. And live telecasts now come from outer space. In 1969, the first astronauts to land on the moon televised their historic’ moon walk’ to viewers on the earth. Since then, astronauts have regularly sent telecast to the earth.
The television became an industry in________.

选项 A、1950
B、the 1960s
C、the 1920s
D、the 1950s

答案D

解析同样是一道考察细节的题型。文中第二段最后一句“By the 1920s inventors and researchers had turned the early theories into working models．Yet it took another thirty years for TV to become industry．”意思是说，电视机要发展成为一种产业还需30年时间，而这个“30年”是以前句中“By the 1920s”为基础的，可见，直到20世纪50年代电视才成为一种产业。由此可知，正确答案是D。

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