5.( ) Which is right according to the story?
A. Great people
read lots of books and asked many questions while they read.
B. Great people
could learn everything from school.
C. People need
to know only some formulas to do math exercises.
D. The teachers cannot
teach their students how to read and how to think.
B
Vision-phones(可视电话)
Radio，telephone and television are widely used in the world，When you switch on the radio, you can listen．But when you use telephone，not only can you listen to others but also you can chat with them，however, you can’t see anything at all. Television is much better
than both of them. People can watch TV and listen to it，but they can’t take part in what they see.
Today, some people are using
a type of telephone called vision-phone.
With it two people who are talking 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 also have other uses
in the future．Some day you
may be able to call up a library and ask to read a book right over your
vision-phone，You may be able to do
some shopping through it, too. Perhaps In the near future, vision-phone will
come into wide use in our everyday life.