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In the United States, the first day nursery was opened in 1854. Nurseries were established in various areas during the (1) half of the 19th century; most of (2) were charitable. Both in Europe and in the U.S, the day nursery movement received great (3) during the First World War, when (4) of manpower caused the industrial employment of unprecedented(前所未有的) numbers of women. In some European countries nurseries were established (5) in munitions(军火) plants, under direct government sponsorship. (6) the number of nurseries in the U.S. also rose (7) , this rise was accomplished without government aid of any kind. During the years following the First World War, (8), federal, state, and local governments gradually began to exercise a measure of control (9) the day nurseries, chiefly by (10) them.The (11) of the Second World War was quickly followed by an increase in the number of day nurseries in almost all countries, as women were (12) called upon to replace men in the factories. On this (13) the U.S. government immediately came to the support of the nursery schools, (14) $6,000,000 in July, 1942 for a nursery school program for the children of working mothers. Many states and local communities (15) this Federal aid. By the end of the war, in August 1945, more than 100,000 children were being cared (16) in daycare centers receiving federal (17). Soon afterward, the federal government (18) cut down its expenditures for this purpose and later (19) them, causing a sharp drop in the number of nursery schools in operation. However, the expectation that most employed mothers would leave their (20) at the end of the war was only partly fulfilled.

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When you choose a freezer, remember it’s probably going to be with you for a long time. No single style or size is best, so it’s important to know which freezer is right for your needs.First, decide if you want an upright or chest model. Uprights are more convenient. Their storage space is more accessible and they take up less floor area. However, chest models are more energy-efficient because less cold air escapes when they are open.If you’re buying an upright, you’ll have to choose between frostless or manual defrost. Chest freezers are always manual. Frostless freezers automatically defrost at preset intervals and remove the water. Manual models must be defrosted by hand every few months or whenever frost accumulates to about a quarter of an inch.To help your freezer reach a ripe old age, try to find a spot that’s cool, dry, and away from drafts. Drafts and heat will raise the freezer’s cabinet temperature and make it work harder to keep cool. That means wasted energy and a shortened compressor life.Dry air is important because high humidity can cause the freezer to rust outside and frost up inside. With proper care, a freezer can serve you for 15 years or more.Frostless models require less care than manual defrost freezers. The interior of a frostless unit should be washed periodically with warm water and baking soda or a mild soap, rinsed, and dried.To get the most from your freezer, check regularly to make sure it’s providing a true zero-degree temperature.Keep the freezer at least three-quarters full. The emptier it gets, the more energy is was wasted. If more than three pounds of food per cubic foot of storage space is added every 24 hours, the resulting high or low temperatures can damage the food.1. Which is NOT the difference between upright model freezer and chest model freezer?2. The underlined word “manual” in the third paragraph means(  ).3. According to the passage, choosing the best place for your freezer means(  ).4. Which is NOT mentioned about the factors which can influence the life span of freezers?5. Which statement best describes the main idea of the passage?

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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 for 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 and 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 pattern recognition proficiency of the individual molecules that make up each brain cell. The best way to build an artificially intelligent device, he claims, would be to build it around the same sort of molecular skills.Right now, the notion that conventional computers and software are fundamentally incapable of matching the processes that take place in 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.1. The author says that the powerful computers of today(  ).2. The new trend in artificial intelligence research stems from(  ).3. Conrad and his group of AI researchers have been making enormous efforts to(  ).4. What’s the author’s opinion about the new AI movement?5. Which of the following is closet in meaning to the underlined phrase “the only game in town” (Line 3, Para. 4)?

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 The Moon, which has undergone a distinct and complex geological history, presents a striking appearance. The moon may be divided into two major terrains: the maria (dark lowlands) and the terrace (bright highlands). The contrast in the reflectivity (the capability of reflecting light) of these two terrains suggested to many early observers that the two terrains might have different compositions, and this supposition was confirmed by missions to the Moon such as Surveyor and Apollo. One of the most obvious differences between the terrains is the smoothness of the maria in contrast to the roughness of the highlands. This roughness is mostly caused by the abundance of craters; the highlands are completely covered by large craters (greater than 40-50km in diameter), while the craters of the maria tend to be much smaller. It is now known that the vast majority of the Moon’s craters were formed by the impact of solid bodies with the lunar surface.Most of the near side of the Moon was thoroughly mapped and studied from telescopic pictures years before the age of space exploration. Earth-based telescopes can resolve objects as small as a few hundred meters on the lunar surface. Close observation of craters, combined with the way the Moon diffusely reflects sunlight, led to the understanding that the Moon is covered by a surface layer, or regolith, which overlies the solid rock of the Moon. Telescopic images permitted the cataloging of a bewildering array of land forms. Craters were studied for clues to their origin, the large circular maria were mapped. Wispy marks on the surface (known as rays) emanating from certain craters were seen. Strange, sinuous features were observed in the maria. Although various land forms were catalogued, the majority of astronomers’ attention was fixed on craters and their origins.Astronomers have known for a fairly long time that the shape of craters changes as they increase in size. Small craters with diameters of less than 10-15km have relatively simple shapes. They have rim crests that are elevated above the surrounding terrain, smooth, bowl-shaped interiors, and depths that are about one-fifth to one-sixth their diameters. The complexity of shape increases for larger craters.1. What does the passage mainly discuss?2. The underlined word “undergone” in Line 1 is closest in meaning to(  ).3. According to the passage, the maria differ from the terrace mainly in terms of(  ).4. According to the passage lunar researchers have focused mostly on(  ).5. The passage probably continues with a discussion of(  ).

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