题目内容
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5：Farmers should not be blamed for the rise because______.
A.they produce the vegetables and other things
B.they get only a small share in the profit
C.they work very hard
D.their cost of living has also risen
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更多“5：Farmers should not be blamed…”相关的问题
Which must be wrong for the Asians to change their lifestyle？
[A] Farmers should live more closely with their poultry.
[B] Farmers should vaccinate their poultry regularly.
[C] Farmers should avoid selling live poultry in the market.
[D] People should avoid buying live poultry in the market.
A.should
B.would
C.might
D.could
Farmers should not be blamed for the rise because______.
A．they produce the vegetables and other things
B．they get only a small share in the profit
C．they work very hard
D．their cost of living has also risen
Which of the following is NOT included in the scientists' suggestions？
A．Farmers should use less insecticides.
B．Farmers should use a combination of two or three insecticides at once.
C．At certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect.
D．Farmers should regularly spray crops as a precaution against problems that are caused by large numbers of pests.
听力原文： Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
Scientist hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
What have scientists discovered about plants and insects？
A．Plants produce many poisonous chemicals for defense against insects.
B．Insects develop ways of dealing with natural poisonous chemicals but not man-made ones.
C．Farmers must spray plants all the time.
D．Farmers must use different brands of insecticides.
What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
(33)
A．Insects have developed some sort of resistance to man-made poisons.
B．Insects have been eating plants for about 250 million years.
C．Farmers sometimes use a combination of two or three insecticides at once.
D．New insects mate with insecticide-surviving insects.
听力原文： Scientists have observed that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and,in fact,have been eating plants for about 250 million years.Now insects are using these same mechanisms to deal with man-made poisons-insecticide.This is why resistance of insects to insecticide has developed so rapidly.What should be done？Scientists studyilg the problem suggest that farmers use less insecticide.At the moment,famlers regularly spray crops as a precaution against problems that are caused by large numbers of pests.They should,instead,spray only where pests have actually been seen.Secondly,farmers could use a combination of two or three jnsecticide at once.To survive,the insects would need to become resistant to two or more poisons at the same time.The most surprising suggestion,perhaps,perhaps,is that,at certain times of the year,famers should actually try to attract new insects onto the crops they are trying to protect.The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super bugs which may be resistant to all our poisons invade our farms and devour our crops.
(30)
A．There are 250 million plants eaten by insects.
B．There are fewer plants than 250 million years ago.
C．They have their way of guarding against insects.
D．They have a better immune system than before.
【M1】
听力原文： Windbreaks are barriers formed by trees and other plants. Farmers plant these barriers around their fields to protect their land.
Windbreaks stop the wind from blowing soil away (33) . They also keep the wind from destroying or damaging crops. They are very important for protecting grain crops.
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 (33) .
But windbreaks seem to work best when they allow some winds to pass through them (341. If the wall of trees and plants blocks the 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.
There should be at least two lines in each windbreak. one line should be large treas. 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.
If the quality of the land is not very good, studies have shown that one kind of tree that can grow well is the white pine (35) .
Windbreaks not only protect land and crops from the wind. Surplus trees can be cut down and used to provide wood (33) .
(34)
A．They can prevent soil from being blown away.
B．They can improve the yield of crops.
C．They can provide wood when cut down.
D．They can protect crops from the strong sunshine.
根据短文，回答6~10题The long years of food shortage in this country have suddenly given way to apparent abundance．Stores and shoDs are choked with food． Rationing is virtually suspended，and overseas suppliers have been asked to hold back deliveries．Yet，instead of joy，there is widespreaduneasiness and confusion．Why do food prices keep on rising，when there seems to be 80 much more food about？Is the abundance only temporary，or has it come to stay？Does it mean that we need to think less now about producing more food at home？No one knows what to expect． The recent growth of export surpluses on the world food market has certainly been unexpectedly great， partly because a strange sequence of two successful grain harvests in North America is now being followed by a thirdI Mrost of Britain’s overseas suppliers of meat，too，are offering more this year and home production has also raised． But the effect of all this on the food situation in this country has been made worse by simultaneous rise in food Drices，due chiefly to the gradual cutting down of government support for food．The shops are over- stocked with food not only because there is more food available but also because people，frightened by high prices，are buying 1ess of it．Moreover，the rise in domestic prices has come at a time when world prices have begun to fall with the resuit that imported food，with the exception of grain，is often cheaper than the home- Droduced variety． And now grain prices,to0，are falling．Consumers are beginning to ask why they should not be enabled to benefit from this trend．The significance of these developments is not lost on farmers． The older generations have seen it all happen before．Despite the present price and market guarantees,farmers fear they are about to be squeezed between cheap food imports and a shrinking home market．Present production is running at 5 1 percent above pre-war levels，and the government has called for an expansion to 60 percent by 1956；but repeated ministerial advice is carrying little weightand the expansion program is not working very well． The main purpose of the first paragraph is__________． [A]to show the reason of food shortage[B]to explain the conflict between the surplus of food supply and rising prices [C]to show the deteriorating living conditions of farmers[D]to analyze the market demand for food supply
