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首字母填空!Radio,telephone and television are widely used in worl

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首字母填空!
Radio,telephone and television are widely used in world.When you (t ) on the radio,you can listen.But when you use the telephone,not only can chat with them.However,you cannot see (a ) at all.Television is much better than both of them.People can watch TV and listen it,but they cannot take part in what they see.
Today,some people are using a new type of telephone called vision phone.With it two people who are (t ) can see each other.
Vision phones can be of great use when you have something to show the person whom you are calling.It may (a ) have other uses in the future.Some day you may be able to call up a library and ask to read a book over your vision phone.You may be able to do (s ) through it instead of going to the supermarket.Perhaps in the near future,vision phones will come into wide use in our everyday life.
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