Wind is the great maker of waves. There are exceptions, such as the tidal(潮汐的) waves some??times produced by earthquakes under the sea. But the waves most of us know are produced by winds blowing over the sea.

Now before constructing an imaginary life history of a typical wave, we need to know certain physical things about it. A wave has height, from trough (low point) to crest (high Point). It has length-the distance from this crest to that of the following wave. The period of the wave means the time it takes for succeeding crests to pass a fixed point. None of these things stays the same-for all depend upon the wind, upon the depth of the water and many other matters.

The water that makes up a wave does not advance with it across the sea. Each drop of water turns around in a little circle with the passing of the wave, but returns very nearly to its original position. And it is fortunate that this is so. For if the huge masses of water that make up a wave actually moved across the sea, sailing would be impossible.

If we want to find the speed of a wave, we may use the following way:

Speed = wavelength × frequency

Here, wavelength is the distance between two high points (crests), frequency means the number of cycles per second.

What causes waves?

A. Earthquakes and nothing else.         B. Only wind.

C. Wind causes most waves.                D. Wind causes some waves.

Which of the following is true according to the passage?

A. The water of a wave moves away across the sea.

B. The water of a wave remains almost at the same place.

C. The water of a wave goes with the passing of the wave.

D. The length of a wave means the distance from the top of a wave to the bottom.

The speed of Wave 1 is 100 cm/s, frequency 10. The frequency of Wave 2 is 300, while its speed is twice that of Wave 1. Which of the following is right?

A. The wavelengths of the two are equal.

B. The wavelength of Wave 1 is 10 times longer than that of Wave 2.

C. The wavelength of Wave 2 is longer than that of Wave 1.

D. The wavelength of Wave 1 is longer than that of Wave 2.

Greg Woodburn, a student at the University of Southern California, spends a lot of time cleaning sneakers he collected.But soon the shoes will be sent to poor children in the United States and 20 other countries, thanks to Woodburn’s Share Our Soles (S.O.S.) charity.
A high school track star in the town of Ventura, California, Woodburn was treated in hospital for months with knee and hip injuries.
“I started thinking about the health benefits, the friendship and the confidence I got from running,” he says, “And I realized there are children who don’t even have shoes.”
Woodburn gathered up his old sneakers, then asked his friends to donate.His goal was to have 100 pairs by Christmas this year.When he collected more than 500 pairs, he decided to turn the shoe drive into a year-round endeavor.
Back then, the sneakers came from donation boxes at the YMCA and the local sporting goods store and from door-to-door pickups.Woodburn has now set up collection boxes at two high schools, city gym and recreation center.He has started accepting adult sizes and sandals.So far, S.O.S has collected and donated more than 3,000 pairs.
Woodburn has cleaned all the shoes.After sorting the shoes by size, Woodburn selects the good shoes for the washing machine and the worn-out ones for recycling.
To ship the footwear, Woodburn teamed with Sports Gift, a nonprofit organization that provides soccer and baseball equipment to children around the world.Keven Baxter, founder and president, says, “We’d send kids balls and shoes.I've heard that for many of these kids, these old sneakers are the only shoes they had.They wear them to school and to do sports.So Greg’s running shoes were a nice addition for us.”
For many recipients, the shoes represent opportunity.Two young boys in Southern California attended school on alternate days because they shared a pair of shoes.They were too big for one boy and too small for the other.Thanks to S.O.S., each brother received his own pair of shoes.The boys now attend school daily and enjoy their learning.When they graduate, they say, they will help a stranger, just as Woodburn helped them.
【小题1】What caused Greg Woodburn to donate old shoes for poor children?

A.The benefits from playing sports.
B.News about some poor children.
C.His reflection to school life.
D.The medical treatment he received.
【小题2】When collecting more sneakers than expected, Woodburn decided to          .
A.include adult sizes and sandals
B.set up branches in different cities
C.collect shoes throughout the year
D.expand his endeavor in the whole city
【小题3】How did Woodburn manage to deliver the shoes collected?
A.By sending them by mail.
B.By working with Sports Gift.
C.By advertising for those in need.
D.By offering them from door to door.
【小题4】What can we learn from Keven Baxter’s remarks?
A.Sports Gift is popular around the world.
B.Many children need Greg’s old sneakers.
C.Greg’s running shoes are the best gifts for children.
D.International organization should provide more help.

Chinese high school students have the longest study hours compared to their peers(同龄人)in Japan , the US  and South Korea. A survey conducted by the four countries said.

The survey, released by the China Youth and Children Research Center on Monday, was jointly conducted with instructions in the four countries in September-October of 2008. It covers nearly 4,000 students in senior schools and vocational high schools in the four countries. About 78.3 percent of Chinese students said they spend more than eight hours at school and 56.7 percent said they study at least two more hours each day at home .by contrast, only 24.7 percent of their peers in the US , 20.5percent in Japan and 15.4 in Korea study more than two hour s after school.

Around 60 percent of all students surveyed said their burden for studies was the heaviest. However the Japanese felt their burden was the worst with respondents (应答者) reaching 79.2 percent

Among the five biggest headaches for young people in the four countries were: 0ver-sheduling ranked first, followed by a boring leisure life, unsatisfied appearance, little time for exercise and making friends, and no spare money

“Moderate(适度的)study pressure can better drive students to develop, however, too much will press their development space, and can even cause harm to their physical and psychological health” the survey said

“Balancing their studies and all round development is a very important task” it said.

1.What would be the best title for the text?

A.Chinese high school students study more

B.high school students need more rest

C.heavy burdens of high school students

D.big headaches of high school students

2. Which of the following is not true about the survey?

A.it took about two months.

B.it was conducted in four countries.

C.Nearly 4,000 students took part in it.

D.it was done only in senior high schools.

3. Which of the following troubles the high school students most?

A.being busy

B.feeling bored

C.lacking pocket money

D.feeling unsatisfied with their teachers

4. According to the survey, ________

A.study pressure is harmful to students’ health

B.students need to achieve all round development

C.the Chinese students felt their burden for studies were the heaviest

D.most students are suffering from physical and psychological health problems

 

Greg Woodburn, a student at the University of Southern California, spends a lot of time cleaning sneakers he collected.But soon the shoes will be sent to poor children in the United States and 20 other countries, thanks to Woodburn’s Share Our Soles (S.O.S.) charity.

A high school track star in the town of Ventura, California, Woodburn was treated in hospital for months with knee and hip injuries.

“I started thinking about the health benefits, the friendship and the confidence I got from running,” he says, “And I realized there are children who don’t even have shoes.”

Woodburn gathered up his old sneakers, then asked his friends to donate.His goal was to have 100 pairs by Christmas this year.When he collected more than 500 pairs, he decided to turn the shoe drive into a year-round endeavor.

Back then, the sneakers came from donation boxes at the YMCA and the local sporting goods store and from door-to-door pickups.Woodburn has now set up collection boxes at two high schools, city gym and recreation center.He has started accepting adult sizes and sandals.So far, S.O.S has collected and donated more than 3,000 pairs.

Woodburn has cleaned all the shoes.After sorting the shoes by size, Woodburn selects the good shoes for the washing machine and the worn-out ones for recycling.

To ship the footwear, Woodburn teamed with Sports Gift, a nonprofit organization that provides soccer and baseball equipment to children around the world.Keven Baxter, founder and president, says, “We’d send kids balls and shoes.I've heard that for many of these kids, these old sneakers are the only shoes they had.They wear them to school and to do sports.So Greg’s running shoes were a nice addition for us.”

For many recipients, the shoes represent opportunity.Two young boys in Southern California attended school on alternate days because they shared a pair of shoes.They were too big for one boy and too small for the other.Thanks to S.O.S., each brother received his own pair of shoes.The boys now attend school daily and enjoy their learning.When they graduate, they say, they will help a stranger, just as Woodburn helped them.

1.What caused Greg Woodburn to donate old shoes for poor children?

A.The benefits from playing sports.

B.News about some poor children.

C.His reflection to school life.

D.The medical treatment he received.

2.When collecting more sneakers than expected, Woodburn decided to          .

A.include adult sizes and sandals

B.set up branches in different cities

C.collect shoes throughout the year

D.expand his endeavor in the whole city

3.How did Woodburn manage to deliver the shoes collected?

A.By sending them by mail.

B.By working with Sports Gift.

C.By advertising for those in need.

D.By offering them from door to door.

4.What can we learn from Keven Baxter’s remarks?

A.Sports Gift is popular around the world.

B.Many children need Greg’s old sneakers.

C.Greg’s running shoes are the best gifts for children.

D.International organization should provide more help.

 

 

 

 

Wind is the great maker of waves. There are exceptions, such as the tidal waves, sometimes produces by earthquakes under the sea. But the waves most of us know are produced by winds blowing over the sea.?Now before constructing an imaginary life history of a typical wave, we need to know certain physical things about it. A wave has height, from trough (low point)to crest (high point),and it has length—the distance from this crest to that of the following wave. The period of the wave means the time it takes for succeeding crests to pass a fixed point. None of these things stays the same— for all depend upon the depth of the water and many other matters.?

The water that makes up a wave does not advance with it across the sea. Each drop of water turns around in a little circle with the passing of the wave, but returns very nearly to its original position. And it is fortunate that this is so, for if the huge masses of water that make up a wave actually moved across the sea, sailing would be impossible.

If we want to find the speed of a wave, we may use the following way:

Speeding=Wavelength×Frequency

Here, wavelength is the distance between two high points (crests), frequency means the number of cycles per second.?

41.What causes waves according to the passage??

Earthquakes and nothing else.   B. Wind and volcanos.

C. Wind and earthquakes.          D. Wind and water.

42.Which of the following is true according to the text??

A. The water of a wave moves away across the sea.?

B. The water of a wave remains almost in the same place.?

C. The water of a wave goes with the passing of the wave.?

D. The length of a wave means the distance between crest and trough.

43.The underlined word “succeeding” means__________.?

A. reaching an aim    B. doing well?  C. following after   D. taking place

44.If the speed of wave 1 is 100 cm/s, and its frequency 10;and the frequency of wave 2 is 300,while its speed is twice that of wave 1.Which of the following is true??

A. The wave-lengths of the two are equal.?

B. The wave-length of wave 1 is 10 times longer than that of Wave 2.?

C. The wave-length of wave 2 is longer than that of wave 1.?

D. The wave-length of wave 1 is longer than that of wave 2.?

 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网