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 travels 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.”

1. Miss Gogers was teaching her class_________.

A. how to telephone 　                 B. about electricity 　

C. about time zone(时区) 　             D. about sound

2.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 grasped（理解）her lesson .D. sound waves were slower than electricity

3.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

4.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

5.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

Time Zones（时区）

Strange things happen to time when you travel. Because the earth is divided into twenty-four zones one hour apart（相差）.You can have days with more or fewer than twenty-four hours, and weeks more or fewer than seven days.

If you make a five-day trip across the Atlantic Ocean(大西洋)，your ship enters a different time zone every day. As you enter each zone, the time changes one hour. Travelling west ,you set your clock back; traveling east , you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.

If you travel by ship across the Pacific（太平洋）, you cross the international date line. By agreement, this is the point where a new day begins, when you cross the line, you change your calendar one full time day, backward or forward. Travelling east, today becomes yesterday; traveling west, it is tomorrow.

1.Strange things happen to time when you travel because______.

A．no day really has 24 hours                B．the earth is divided into time zones

C．time zones are not all the same size          D．no one knows where time zones are

2.From this passage it seems true that the Atlantic Ocean___.

A．is divided into five time zones              B．is divided into 24 time zones

C．is in one time zone                      D．cannot be crossed in five days

3.If you cross the ocean going west, you set your clock_____.

A．ahead by 25 hours in a new time zone       B．one hour ahead for the whole trip

C．back one full day for each time zone         D．one hour back in each new time zone

4.The international date line is the name for______.

A．the beginning of any new time zone         B．the point where a new day ends

C．the point where a new day begins           D．any time zone in the Pacific Ocean

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 travels 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.”

1. 1.

   Miss Gogers was teaching her class_________

   1. A.
      how to telephone 　
   2. B.
      about electricity 　
   3. C.
      about time zone(时区) 　
   4. D.
      about sound
2. 2.

   Miss Gogers raised this question because she wanted to know whether______

   1. A.
      it was easy to phone to Los Angeles 　
   2. B.
      her student could hear her from 75 feet away
   3. C.
      her students had grasped（理解）her lesson
   4. D.
      sound waves were slower than electricity
3. 3.

   Tom thought that electricity was _________

   1. A.
      slower than sound waves　　
   2. B.
      faster than sound waves
   3. C.
      not so fast as sound waves 　　
   4. D.
      as fast as sound waves
4. 4.

   Kate thought Tom was wrong because _______

   1. A.
      clocks in Los Angeles showed a different time from those in New York
   2. B.
      electricity was slower than sound waves
   3. C.
      Tom was not good at physics at all
   4. D.
      Tom’s answer had nothing to do with sound waves
5. 5.

   Whose answer do you think is correct according to the law of physics?

   1. A.
      Tom’s
   2. B.
      Kate’s
   3. C.
      Bath A and B
   4. D.
      Neither A nor B