Hubert Joseph Schlafly was an electrical engineer who helped change the way actors, politicians and other people speak on television．In 1950, he and two other men developed the teleprompter．One co-worker, Fred Barton, was an actor．He had an idea for a tool that would help television actors read their lines without having to memorize them．The other co-worker was Irving Kahn．He worked as vice-president of radio and television at 20th Century Fox．
The first teleprompter involved a erson who held a long piece of paper printed whth big letters．As the actor read the lines, another person would move the paper ahead on the device(装置)。The teleprompter was first used on a television program called “The First Hundred Years．”Later versions used television screens to show the words that were to be read．
Hub Schlafly and his co-workers believed that many companies would want to buy the teleprompter．So, they left their jobs and created the TelePrompTer Corporation to sell their invention．
In 1952, former President Herbert Hoover became the first politician to use a teleprompter．The former president was speaking at the Republican National Convention in Chicago, USA．For a brief time, he stopped reading and began to talk about a subject not written in his speech．When Hoover wanted to continue the speech, the words on the teleprompter were not moving．He then said the machine should be restarted and viewers became aware of the new invention．Many reporters wrote about that incident, creating a new level of publicity(宣传)for the teleprompter．
Soon more and more politicians started to use it to face the television camera while reading prepared statements, instead of looking down at their notes．Then the device was used for almost all live television broadcasts．
(1)
What is the text mainly about?
[ ]
A．
A new form of TV program．
B．
A great US electrical engineer．
C．
The influence of an electrical company．
D．
The history of a useful electrical device．
(2)
When using the teleprompter, people are able to ________．
[ ]
A．
memorize what they want to say very quickly
B．
practice their speech skills as if they were on TV
C．
face the TV while giving a speech
D．
see themselves on TV as they are making a speech
(3)
When Hoover started to give his speech, ________．
[ ]
A．
he forgot to turn on the teleprompter
B．
he decided to stop using the teleprompter
C．
people didn't know he used a teleprompter
D．
people didn't think the teleprompter would work
(4)
What was the effect of the incident happening during Hoover's speech?
