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  3. From which languages is the word "television" taken? How is television different from radio?

From which languages is the word "television" taken? How is television different from radio?

admin2009-03-15  14
问题 From which languages is the word "television" taken?
How is television different from radio?
选项 A、Sound is changed into electromagnetic waves.
B、Light is changed into electromagnetic waves.
C、Both sound and light are changed into electromagnetic waves.
D、Either sound or light is changed into electromagnetic waves.
答案B
解析 此题问及电视机和收音机工作原理的不同点。由第二段可知“光被转换成电磁波”是二者工作原理的不同点。[A]“声音被转换成电磁波”讲的是两者工作原理的共同点；[C]“声和波被转换成电磁波”是电视机的工作原理；[D]是两者取其一，显然错误。
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