There are few families in the United States that do not have either a radio or television set. Both of them have become a necessary part of our daily life, keeping us filled with the news of the day, teaching us in many fields of interest, and making us happy with singing, dancing and acting.
Marconl, the Italian inventor, who gave us the radio, probably didn’t know how much his great invention would have done for the world in the years to come. Radio had, perhaps done as much as any other communication tool. Things of the world can be reported to people everywhere a few seconds after they happen. Travelers in or out of–the–way places, ships at sea even astronauts round the earth are able to keep in touch with each other by radio.
Television is another important invention. It lets us see as well as hear the actor. Since its appearance, TV has done a great deal in the daily life of people everywhere. Many programs are now televised in color.
Perhaps the most modern invention is “Telstar”, a “star” moving round the earth. It makes it possible for the people all over the world to be closer than ever before. Now a family in Chicago can watch on TV a motor–car race in Italy, a table tennis competition in Beijing or a volleyball match in Japan as these events are actually happening!
小题1:The passage tells us that __________ in the U.S.A. have no radio or television set.
A. few families B. all the families C. many families D. a few families
小题2:Who do you think the writer of the passage is?
A．An Italian.
B．A Japanese.
C．An American.
D．A Chinese.小题3:Why does the passage say radio and TV have become a necessary part of our daily life?
A．Because they have touched nearly everything in our life.
B．Because men would not live happily without them.
C．Because they are the only ways to spread information.
D．Because no communication means no life.小题4: What is a “Telstar” used to do according to the passage?
A．To receive and store information only.
B．To move around the earth just like the moon.
C．To give light onto the earth at night.
D．To help send out radio or TV information to the world.小题5: When the writer introduces Marconl in the second paragraph, he means __________.
A．he was just an Italian inventor
B．his invention has done much for the world
C．he had reported much to people all over the world
D．he helped people travel a lot around the world
和
来计算，可是由于本题中不知道W和t，所以只能用
，此时I<U/R或U>IR,决不能乱套用公式，计算电功率只能用
。