题目内容
Farmers use different kinds of soil conservation methods to protect their land from damage by farming and the forces of nature . One important form of soil conservation is the use of windbreaks . Windbreaks are barriers formed by trees and other plants with many leaves . Farmers plant them in lines around their fields .
Windbreaks stop the wind from blowing soil away . They also keep the wind from destroying or damaging crops . They are very important for growing grains , such as wheat . There have been studies done on windbreaks in parts of West Africa , for example . These found that grain harvests can be twenty percent higher in fields protected by windbreaks compared to fields without such protection .
However , windbreaks seem to work best when they allow a little wind to pass through . If the wall of trees and plants stops wind completely , then violent air motions will take place close to the ground . These motions will lift soil into the air where it will be blown away .
For this reason , a windbreaks is best if it has only sixty to eighty percent of the trees and plants needed to make a solid line . An easy role to remember is that windbreaks can protect areas up to ten times the height of the tallest trees in the windbreaks .
These should be at least two lines in each windbreak . One line should be large trees . The second line , right next to it , can be shorter trees and other plants with leaves . Locally grown trees and plants are best for windbreaks .
- 1.
What is the best title for the passage?
- A.Building a windbreak to protect soil
- B.Building a windbreak to protect crops
- C.Using a windbreak to improve grains
- D.Using a windbreak to improve plants
- A.
- 2.
In the fifth paragraph the author tells us windbreaks______.
- A.do not work at all
- B.do not stop wind fully
- C.will not take place
- D.will not allow wind to pass through
- A.
- 3.
According to the passage , which of the following statement is wrong ?
- A.Windbreaks are barriers .
- B.Windbreaks can be used to make fences .
- C.In general , there are two lines in all in every windbreak .
- D.Windbreaks can protect areas .
- A.
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完形填空 (共15小题;每小题2分,满分30分)
阅读下面短文,从短文后所给各题的A、B、C、D四个选项中选出能填入相应空白处的最佳选项,并在答题卡上将对应题号的相应选项字母涂黑。
Computers have done us a lot since they turned up. In the future they will play a more important part in many _____16_____, such as education, transport, personal lives, scientific research and so on. Nowadays computers are being _____17_____ in agriculture and industry and can help the farmers to _____18_____ the conditions of the plants.
More and more computers will come into our daily life with the _____19_____ of science and technology. If you want to change money or pay your electricity bills, you won’t have to go to the _____20_____. A computer and a telephone will help you. It can also help you to do the housework and it can even _____21_____ human voices and carry out the instructions. It is _____22_____ that the majority of the labour force will work at home. People will be able to use the videophone for conferences. This can help us to save a lot of energy and _____23_____. It is said that trains in Japan will have no _____24_____, because they’ll be well _____25_____ by computers, which can also tell the best _____26_____ between trains.
Computer programmes for _____27_____ whole texts are already well developed. You can _____28_____ the name of a certain subject and a _____29_____ list of book titles will _____30_____ on your screen. You may choose whichever you want.
【小题1】
A.families | B.fields | C.factories | D.places |
A.used | B.put | C.shown | D.given |
A.form | B.grow | C.control | D.manage |
A.increase | B.progress | C.production | D.development |
A.office | B.bank | C.shop | D.post office |
A.understand | B.carry | C.hear | D.recognize |
A.important | B.necessary | C.possible | D.complete |
A.material | B.time | C.place | D.money |
A.conductors | B.drivers | C.instructors | D.indicators |
A.operated | B.done | C.made | D.run |
A.position | B.direction | C.distance | D.way |
A.storing | B.writing | C.remaining | D.recording |
A.give | B.put | C.type | D.write |
A.first-rate | B.world-famous | C.nationwide | D.worldwide |
A.show | B.appear | C.offer | D.come |
We human beings haven’t been good friends to animals. For thousands of years, we have been polluting the environment, making it hard for animals to live on the planet. We have been killing animals for their fur, feathers or meat, or simply because they are dangerous. As a result, many kinds of animals have disappeared forever. Hundreds more are on the endangered list today.
Should we care about animals? Of course we should. If animals of a certain kind all disappear, they will never come back again. Animals are more than just resources of things we need. Every kind of animal has its place in the balance of nature. Destroying any kind of animal can lead to many problems. For example, when farmers killed large numbers of hawks, the corn and grain that the farmers stored were destroyed by rats and mice. Why? Because hawks eat rats and mice. With less and less hawks to keep down their numbers, rats and mice multiplied quickly. And if people kill too many birds, more and more insects will eat the crops.
Luckily, we’ve realized that we shouldn’t kill animals any more. And people are working hard to save those animals that would disappear soon. The government also passed laws to protect the endangered animals. In fact, quite a few countries have passed such laws. These laws forbid the killing of any kind of animal on the endangered list. We should try our best to protect and save the endangered animals.
【小题1】The text calls on us to__________.
A.keep animals at home | B.protect the environment |
C.protect the endangered animals | D.know more about the balance of nature. |
A.Animals cause many serious problems. |
B.They kill animals for something they need. |
C.Animals destroy their natural resources. |
D.They kill animals to protect the environment |
A.there were too many rats and mice |
B.hawks are the most important in the nature |
C.animals are good food resources |
D.every kind of animal is important in nature |