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There is now a race for science, technology, and industry to keep the output of food rising faster than the number of people to be fed. New strains of crops are being developed which will thrive in unfavorable climates: there are now farms beyond the Arctic Circle in Siberia and North America; irrigation and dry-farming methods bring arid lands under the plough, dams hold back the waters of great rivers to ensure water for the fields in all seasons and to provide electric power for new industries; industrial chemistry provides fertilizers to suit particular soils; aeroplanes spray crops to destroy locusts and many plant diseases. Every year some new means is devised to increase or to protect the food of the world.
31. The author says that the world population is growing because _____.
A) there are many rich valleys and fertile plains
B) the pattern of distribution is being altered
C) people are living longer
D) new land is being brought under cultivation
32. The author says that in densely populated areas the land might be more productively farmed if _____.
A) the plots were subdivided
B) a large part of the people moved to a different part of the country
C) industrial methods were used in farming
D) the units of land were made much larger
33. We are told that there are now farms beyond the Arctic Circle. This has been made possible by _____.
A) producing new strains of crops
B) irrigation and dry-farming methods
C) providing fertilizers
D) destroying pests and disease
34. Which of these words is nearest in meaning to the word "strains"?
A) types B) sizes
C) seeds D) harvests
35. The author's main purpose is to _____.
A) argue for a belief B) describe a phenomenon
C) entertain D) propose a conclusion
Passage Four
Questions 36 to 40 are based on the following passage.
For some time past it has been widely accepted that babies-and other creatures-learn to do things because certain acts lead to "rewards"; and there is no reason to doubt that this is true. But it used also to be widely believed that effective rewards, at least in the early stages, had to be directly related to such basic physiological(生理的) "drives" as thirst or hunger. In other words, a baby would learn if he got food or drink or some sort of physical comfort, not otherwise.
It is now clear that this is not so. Babies will learn to behave in ways that produce results in the world with no reward except the successful outcome.
Papousek began his studies by using milk in the normal way to "reward" the babies and so teach them to carry out some simple movements, such as turning the head to one side or the other. Then he noticed that a baby who had had enough to drink would refuse the milk but would still go on making the learned response with clear signs of pleasure. So he began to study the children's responses in situations where no milk was provided. He quickly found that children as young as four months would learn to turn their heads to right or left if the movement "switched on" a display of lights-and indeed that they were capable of learning quite complex turns to bring about this result, for instance, two left or two right, or even to make as many as three turns to one side.
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