If you want your land to keep fertile, you must try to stop soil from being carried away by water or wind. When soil is taken away by flowing water or blowing winds we call it soil erosion. Ways have been found to stop soil erosion, and this is known as soil conservation. One way of stopping soil erosion is to grow small plants such as grass. These plants are referred to a cover crops, whose roots hold the soil tightly together. The rain water can not wash away the soil. When trees and tall bushes are planted at the edges of an open field, soil erosion by strong winds can not take place. The trees and bushes, which act as a very big and firm wall, protect the open land from the winds. The way to stoop soil erosion on slopes is to build terraces on the slope of hillside and mountainside. When the slope of a hillside is cut into “step”, water carrying soil can not run straight down the terraces, which are used to slow down the speed of the flowing water containing much soil in it. In this way most of the soil in the water is left behind on the terraces, much soil in it.
【小題1】What takes place in soil erosion?

A．Flood happens to the fertile land
B．A large quantity of the soil loses away gradually.
C．Terraces are built on the slope of hillside or mountainside.
D．Plants are grown to protect the open land
【小題2】“Cover crops” in this passage means _________.?
A. grass        B. trees and bushes     C. plants life and an area
E.   covering plants that produce grain or vegetables
【小題3】Besides growing small plants, another method to fight against soil erosion is to ___________.
A．build terracesB．build wallsC．plant treesD．plant tall bushes
【小題4】According to the passage, trees and tall bushes are planted around an open field ________________.
A．because their roots hold soil tightly
B．to stop soil from being blown away by winds.
C．Because soil erosion causes terrible damages to crops
D．To keep the balance of nature
【小題5】Which of the following is the best title of the passage?
A．What Causes Soil Erosion
B．The Importance of Erosion
C．Rain Erosion and Wind Erosion
D．Erosion and the Way of Tight against Erosion


【小題1】B
【小題2】C
【小題3】A
【小題4】B
【小題5】D

解析

練習冊系列答案
相關(guān)習題

科目：高中英語 來源：活題巧解巧練·高二英語·下 題型：050

閱讀理解

　　Chess-playing machines were a common feature at the 19th century carnivals(狂歡節(jié)) .They would take on all competitors and usually wan, but they were all frauds(騙局)with human beings concealed inside.

　　Two centuries later, the “machine” is real.

　　A computer programmer Deep Fritz held world champion, Vladimir Kramnik, to a 4-4 tie. In doing so, Kramnik felt just short of avenging (復仇)the 1997 defeat of his predecessor Garry Kasparov at the hands of IBM's Deep Blue.

　　Deep Fritz is a commercially available product produced by Germany's Chessbase Gmbh. In this match it was running on 8,900 Mhz processors and could analyze 3 million positions a second.

　　Kramnk admitted he found the match exhausting. “ I need some time to recover. ”he said comparing the match with his 2000 defeat of Kasparov. “The pressure is similar but preparing against a computer is much more difficult. It has all the knowledge and you have to be prepared for all openings. With a human, you know that certain openings don't suit his style and won't happen, but not with a computer. ”

　　“The games themselves were different,” he said, “Against a computer, you have a feeling that if you make one mistake, it's over. So it's like going through a minefield. You're always watching for tactics, even in a quiet position.”

　　He also said that computers play faster. “The game has a different rhythm and it puts more pressure on you.”

　　“The main problem, ”he said, “is that you can never understand its logic. In a human sense, it has no logic. With a human opponent, you feel him and you know what path he will take.”

　　Chess enthusiasts have been arguing for centuries whether it's an art, a science, a sport or something else.

　　Kramnik doesn't see the emergence of computers making any difference to this argument. “Chess is very wide. It's not merely these things but a small model of the world. ”

　　Next spring, Kramnik is scheduled to defend his title as Einstein Classical Chess World Champion against Peter Leko of Hungary. While he welcomes a rematch against Fritz, it's not certain when it will take place.

1．The difficulties of competing with the computer doesn't lie in that ________.

[　　]

A．you can never understand its logic

B．the computer plays faster

C．it has all knowledge and you have to prepare for all openings

D．if you make one mistake, it's over

2．The underlined word “exhausing” ( in Para. 5 ) means ________.

[　　]

A．making something interesting

B．making someone excited

C．making someone tired

D．making something endless

3．Put the following events in the right order:

(1) Garry Kasparov was defeated by Deep Blue .

(2)Chess-playing machines were not real.

( 3 ) After competing with Deep Fritz, Kramnik felt exhausted .

(4)Kramnik's competition with Peter Leko of Hungary.

[　　]

A．(2)-(4)-(1)-(3)

B．(2)-(1)-(3)-(4)

C．(2)-(3)-(4)-(1)

D．(1)-(A)-(3)-(2)

4．What did Kramnik think of the chess?

[　　]

A．It became more and more difficult after the chess-playing machines were invented.

B．Chess is an art, a science, a sport, etc.

C．It's more and more popular, with the computer developing.

D．Chess is a small world which is wide.

查看答案和解析>>

科目：高中英語 來源： 題型：

—How much if I wan to take one?

—You can take as many as you like because they are free of _____.

A. cost  B. charge  C. money  D. pay

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Beijing, April 2----Starting from this year, the Beijing Municipal Health Bureau will begin to promote a home medical service. With this service a medical team which is made up of a doctor, a nurse and a medical health worker will be sent to some communities in the city. They will set up a medical filing recorder for every resident in community and publicize their contact information to them. If people in the community feel sick, they can consult their community doctor first. If community doctors cannot treat their illness, they will then be transferred to large hospitals. Liang Wan, deputy director of the Beijing Municipal Health Bureau, made the statement last Friday .

   In addition ,the Beijing Municipal Health Bureau will set up some funds to train home medical service workers for families whose members suffer either from high blood pressure, diabetes,cerebral apoplexy , or coronary heart disease . The home medical service workers will remind patients to take pills on time and lead the patients to follow some health tips in their daily life. They will also learn some practical knowledge to save patients in case of an emergency .

The work will first begin in the medical service room in the 25 community centers and spread to all communities in Beijing. The disease prevention and control centers at various counties and districts in Beijing will be responsible for teaching community doctors and giving home medical service lectures, or advice . These workers will not be able to work until they pass related examination and obtain the work certificates. It is expected that by the end of this year, there will be 10000 home medical service workers in Beijing .

26. Where does a person go to see first if he gets sick according to the passage ?

A. The community clinics.           B. Large hospital .

C. Private clinic .                  D. Small hospital .

27. Which of the following is NOT true according to the passage?

A.The medical team which is made up of a doctor, a nurse and a medical health worker will set up a medical filing record for every resident.

B. The home medical service workers not only give some healthy suggestions to the patients, but also learn practical knowledge about first aid.

C. Some funds will be provided by Beijing Municipal Health Bureau for home medical service training.

D. The government aims to offer the home medical service for free.

28. If you want to work as a home medical worker, you need to _____________.

A. receive the training about medical service.

B. pass related examinations.

C. obtain the work certificates.

D. All the above.

29. What can we learn from the passage?

A. All communities in Beijing have started home medical service.

B. People in Beijing will not easily get ill.

C. Medical service in Beijing will be promoted greatly in the future.

D. The other cities in China should learn from Beijing.

30. The main purpose of the passage is __________

A. to introduce community service in Beijing.

B. to report home medical service available in Beijing.

C. to provide some efficient treatments for diseases in community.

D. to describe a special medical team in Beijing.

查看答案和解析>>

科目：高中英語 來源：2013-2014學年甘肅省高三下學期第一次診斷考試英語試卷（解析版） 題型：閱讀理解

Beijing, April 2----Starting from this year, the Beijing Municipal Health Bureau will begin to promote a home medical service. With this service a medical team which is made up of a doctor, a nurse and a medical health worker will be sent to some communities in the city. They will set up a medical filing recorder for every resident in community and publicize their contact information to them. If people in the community feel sick, they can consult their community doctor first. If community doctors cannot treat their illness, they will then be transferred to large hospitals. Liang Wan, deputy director of the Beijing Municipal Health Bureau, made the statement last Friday .

In addition ,the Beijing Municipal Health Bureau will set up some funds to train home medical service workers for families whose members suffer either from high blood pressure, diabetes,cerebral apoplexy , or coronary heart disease . The home medical service workers will remind patients to take pills on time and lead the patients to follow some health tips in their daily life. They will also learn some practical knowledge to save patients in case of an emergency .

The work will first begin in the medical service room in the 25 community centers and spread to all communities in Beijing. The disease prevention and control centers at various counties and districts in Beijing will be responsible for teaching community doctors and giving home medical service lectures, or advice . These workers will not be able to work until they pass related examination and obtain the work certificates. It is expected that by the end of this year, there will be 10000 home medical service workers in Beijing .

1.Where does a person go to see first if he gets sick according to the passage ?

A. The community clinics.?????????? B. Large hospital .

C. Private clinic .???????? ???????? D. Small hospital .

2.Which of the following is NOT true according to the passage?

A.The medical team which is made up of a doctor, a nurse and a medical health worker will set up a medical filing record for every resident.

B. The home medical service workers not only give some healthy suggestions to the patients, but also learn practical knowledge about first aid.

C. Some funds will be provided by Beijing Municipal Health Bureau for home medical service training.

D. The government aims to offer the home medical service for free.

3.If you want to work as a home medical worker, you need to _____________.

A. receive the training about medical service.????????

B. pass related examinations.

C. obtain the work certificates.???????????????????

D. All the above.

4.What can we learn from the passage?

A. All communities in Beijing have started home medical service.

B. People in Beijing will not easily get ill.

C. Medical service in Beijing will be promoted greatly in the future.

D. The other cities in China should learn from Beijing.

 

查看答案和解析>>

科目：高中英語 來源： 題型：單選題

---How much if I wan to take one?
---You can take as many as you like because they are free of _____


  1. A.
    cost
  2. B.
    charge
  3. C.
    money
  4. D.
    pay

查看答案和解析>>

同步練習冊答案