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推荐文章：1997年6月大学英语四级考试试题听
推荐文章简介：
Section A 1. M: Boating and Skating are my favorite sports. W: I like swimming, but not boating or skating. Q: Which sport does the woman like? 2. W: Have you finished reading my research report. I pu
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22.The chief concern of the American government in the area of agriculture in the 1920s was
______ .
A) to increase farm production B)&
nbsp;to establish agricultural laws
C) to prevent farmers from going bankrupt D) to promote the mechanization of agriculture
23.The Agricultural Adjustment Act encouraged American farmers to ______.
A) reduce their scale of production
B) make full use of their land
C) adjust the prices of their farm products
D) be self-sufficient in agricultural production
24.The Supreme Court rejected the Agricultural Adjustment Act because it believed that the
Act ______.
A) might cause greater scarcity of farm products
B) didn’t give the Secretary of Agriculture enough power
C) would benefit neither the government nor the farmers
D) benefited one group of citizens at the expense of others
25.It was claimed that the new laws passed during the Roosevelt Administration were aimed
at ______.
A) reducing the cost of farmin
B) conserving soil in the long-term interest of the nation
C) lowering the burden of farmers
D) helping farmers without shifling the burden onto other taxpayers
Passage Two
<
br>Questions 26 to 30 are based on the following passage
In the 1950s, the pioneers of artificial intelligence (AI) predicted that, by the end of this century, computers would be conversing with us at work and robots would be performing our housework. But as useful as computers are, they’re nowhere close to achieving anything remotely resembling these early aspirations f or humanlike behavior. Never mind something as complex as conversation the most powerful computers struggle to reliably recognize the shape of an object, the most elementary of tasks for a ten-month-old kid.
A growing group of AI researchers think they know where the field went wrong . The problem, the scientists say, is that AI has been trying to separate the highest, most abstract levels of thought, like language and mathematics, and to duplicate them with logical, step-by-step programs. A new movement in AI, on the other hand, takes a closer look at the more roundabout way in which nature came up with intelligence. Many of these researchers study evolution and natural adaptation instead of formal logic an
d conventional computer programs. Rather than digital computers and transistors, some want to work with brain cells and proteins . The results of these early efforts are as promising as they are peculiar, and the new nature-based AI movement is slowly but surely moving to the forefront of the field.
Imitating the brain’s neural (神经的） network is a huge step in the right direction, says computer scientist and biophysicist Michael Conrad, but it still misses an important aspect of natural intelligence. People tend to treat the brain as if it were made up of color-coded transistors, he explains, but it’s not simply a clever network of switches. There are lots of important things going on inside the brain cells themselves. Specifically, Conrad believes that many of the brain’s capabilities stem from the patternrecognition proficiency of the individual molecules that make up each brain cell. The best way to build and artificially intelligent device, he claims, would be to build it around the same sort of molecular skills.
Right now, the option that conventional computers and software a
re fundamentally incapable of matching the processes that take place in the brain remains controversial. But if it proves true, then the efforts of Conrad and his fellow AI rebels could turn out to be the only game in town.
26.The author says that the powerful computers of today ______.
A) are capable of reliably recognizing the shape of an object
B) are close to exhibiting humanlike behavior
C) are not very different in their performance from those of the 50’s
D) still cannot communicate with people in a human language
27.The new trend in artificial intelligence research stems from ______.
A) the shift of the focus of study on to the recognition of the shapes of objects
B) the belief that human intelligence cannot be duplicated with logical, step-by-step
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