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Can you imagine what life would be like if there is no telephone? You could not call your friends 1 the phone and talk to them. If fire 2 out in your house, you could not 3 the fire department. If somebody were 4 , you could not call a doctor.
In our 5 life, we need to communicate with one another. We do this 6 by speaking to other people and listening to 7 they have to say to us, and as we are 8 to them we can do this very 9 . However, our voices will not travel very far even when we 10 . It is thanks to the 11 of the telephone that we are 12 able to communicate with each other 13 hold conversations when we are far 14 . We can hear each other clearly 15 we were in the same room.
The man who 16 this possible was Alexander Graham Bell, a Scotsman. Bell, a teacher of visible speech 17 later moved to Canada, 18 all his spare time experimenting. He was 19 active in his research for a means of sending speech by electricity that he left 20 time for his day-to-day work and at one time was almost penniless.
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By the time he was ten,Edison______experiments in chemistry.
A.had already done B.already had done
C.was already doing D.already did
查看习题详情和答案>>Miss Gogers taught physics in a New York school. Last month she explained to one of her classes about sound, and she decided to test them to see how successful she had been in her explanation. She said to them,“Now I have a brother in Los Angeles. If I was calling him on the phone and at the same time you were 75 feet away, listening to me from across the street, which of you would hear what I said earlier, my brother or you and for what reason?”
Tom at once answered,“Your brother. Because electricity travaels faster than sound waves.”“That’s every good,”Miss Gogers answered; but then one of the girls raised her hand, and Miss Gogers said.“Yes, Kate.”
“I disagree,”Kate said.“Your brother would hear you earlier because when it’s 11 o’clock here it’s only 8 o’clock in Los Angeles.”
Miss Gogers was teaching her class_________.
A.how to telephone B.about electricity C.about time zone D.about sound
Miss Gogers raised this question because she wanted to know whether______.
A.it was easy to phone to Los Angeles
B.her student could hear her from 75 feet away
C.her students had a good command of her lesson about sound
D.sound waves were slower than electricity
Tom thought that electricity was _________.
A.slower than sound waves B.faster than sound waves
C.not so fast as sound waves D.as fast as sound waves
Kate thought Tom was wrong because _______.
A.clocks in Los Angeles showed a different time from those in New York
B.electricity was slower than sound waves
C.Tom was not good at physics at all
D.Tom’s answer had nothing to do with sound waves
Whose answer do you think is correct according to the law of physics?
A. Tom’s B. Kate’s C. Bath A and B D. Neither A nor B
查看习题详情和答案>>All flights___ because of the snowstorm, we decided to take the train.
|
A．were canceled |
B．had been canceled |
C．having canceled |
D．having been canceled |
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