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

 

Natural ways of keeping time


In ancient times, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields until the sun went down.
Man-made things
The sand clock is made of two glass balls joined by a narrow neck. The top ball was filled with sand. The sand slowly moved through the neck into the bottom ball. People knew how much time had passed when all the sand had fallen to the bottom ball.
People also made the water clock. They made a small hole near the bottom of a pot. Then they filled the pot with water. Markings inside the pot showed how much time passed as the water dripped (滴) out of the hole.
Nature’s Clocks in Living Things
◆Animals’ Body Clock
Animals do not need clocks to know time. They have a way of telling time by their bodies. Birds know when to fly to warmer places before winter. Some animals know when to keep more food for the cold winter months. Some fish know when it is time to move up the river and lay eggs.
◆Plants have their own clocks
Plants also have their own clocks to keep time. Plants know when to open flow­ers or when to drop their leaves.
◆The Body Clock in Human Beings
People also have their own body clocks. When we get used to our lives, our body clocks can be very accurate (准确的). It can tell us when it is time to wake up. It can also tell us when to eat or to go to sleep.
【小题1】How could an ancient farmer know when to go back home in the daytime?

A．By looking at the moon.	B．By looking at the stars.
C．By looking at the sun.	D．By feeling whether tired or not.

【小题2】 How many kinds of living things with nature’s clocks are mentioned here?

A．2.

B．3.

C．5

D．6.

【小题3】From the passage, we know what man-made things have in common is that_______.

A．both of them have a hole.	B．both of them are designed with glass balls.
C．both of them can be used only once.	D．both of them tell time in the same way

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

Natural ways of keeping time

In ancient times, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields until the sun went down.

Man-made things

The sand clock is made of two glass balls joined by a narrow neck. The top ball was filled with sand. The sand slowly moved through the neck into the bottom ball. People knew how much time had passed when all the sand had fallen to the bottom ball.

People also made the water clock. They made a small hole near the bottom of a pot. Then they filled the pot with water. Markings inside the pot showed how much time passed as the water dripped (滴) out of the hole.

 

 

 

 

 

 

Nature’s Clocks in Living Things

◆Animals’ Body Clock

Animals do not need clocks to know time. They have a way of telling time by their bodies. Birds know when to fly to warmer places before winter. Some animals know when to keep more food for the cold winter months. Some fish know when it is time to move up the river and lay eggs.

◆Plants have their own clocks

Plants also have their own clocks to keep time. Plants know when to open flow­ers or when to drop their leaves.

◆The Body Clock in Human Beings

People also have their own body clocks. When we get used to our lives, our body clocks can be very accurate (准确的). It can tell us when it is time to wake up. It can also tell us when to eat or to go to sleep.

1.How could an ancient farmer know when to go back home in the daytime?

A. By looking at the moon.              B. By looking at the stars.

C. By looking at the sun.                D. By feeling whether tired or not.

2. How many kinds of living things with nature’s clocks are mentioned here?

A. 2.           B. 3.             C. 5          D. 6.

3.From the passage, we know what man-made things have in common is that_______.

A. both of them have a hole.                               B. both of them are designed with glass balls.

C. both of them can be used only once.           D. both of them tell time in the same way

 

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.”
【小题1】 Miss Gogers was teaching her class_________.

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

【小题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

【小题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

【小题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

【小题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