单选题 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 electromagnetic 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 offer teaching in various subjects. Some hospital use TV for medical students to get close-up views of operations. At first television programs were broad- cast in black-and-white. With the development 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 Games 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.

【正确答案】 B

【答案解析】辨析题。如不认识这个词，可以从构词角度去理解?该词的词根是calculate“计算”，加上前缀in-意思转为否定。-able为后缀，构成形容词，意为“无法计算的”。还可从上下文判断词义。它后面是冒号，说明下文是对前句的补充说明it can influence…it can also add to…这说明它的影响很大。故B项为正确答案。