单选题The beautiful ______ are made of a special kind of ______ in these factories.

单选题My mother suggests that we ______ eat out for a change this weekend.

单选题I wonder how much ______ .

单选题The author implies that many people attribute Emily Dickinson's seclusion to ______.

单选题You'll find that the community has ______ great changes since you were here last time. A) submitted B) sustained C) perceived D) undergone

单选题Do people everywhere agree on what a mountain is? The fact is that definitions vary. Everyone admits, for example, that Everest is, a mountain, the highest of them all, with an altitude of almost 30000 feet. But what about Snowdon, the loftiest peak in Wales? It rises a mere 3000 feet, yet it is also called a mountain. Comparison, a little matter of relativity, is the key. To the average person living on North America"s Great Plains, Vermont"s Green Mountains look lofty indeed, but to anyone from the Rocky Mountains, the Great Mountains seem nothing more than hills. Geographers generally agree that, to be a mountain topographically (在地形学方面), a landmass must reach, an altitude of 3000 feet above the level of the sea. Mount Everest, for instance, is 30000 feet above sea level, but only 15000 feet above the neighboring Tibetan plateau. Geologists restrict the definition even more, maintaining that a mountain is a mountain by virtue of its geological structure. Some rugged highlands are not really mountains, while some flat, low-lying rock surfaces are true mountains. They are low now because of centuries of erosion. There are even mountains under the sea, the Mid-Atlantic Ridge, for example. Like all true mountains, they were originally formed by large-scale movements of the earth"s crust.

单选题(2002)She didn't break the bad news to her mother_____that she might break down.

单选题There's no need to be frightened of the dog, he's quite ______. A. eager B. harmless C. cheerful D. weak

单选题We have only a few hours so we must ______ our time.

单选题The universe is organized in ______ with, in many cases, pretty wide gaps between them.

单选题Motorcyclists should wear helmets to ______ them from injury.

单选题Great changes ______ in the city, and a lot of buildings ______ ． A．has been taken place; have been set up B．have taken place; have been set up C．have taken place; have set up D．were taken place; were set up

单选题Woman: You are too careful. I can hardly put up with a car moving at this speed. Man: Once bitten twice shy. I was involved in a head-on collision a few months ago. I don"t want to repeat it. Question: What can we learn from the conversation?

单选题{{B}}Part B{{/B}} Malnutrition during weaning age—when breast milk is being replaced by semi-solid foods—is highly prevalent in children of poor households in many developing countries. While the etiology (病因学) is complex and multifactorial, the immediate causes are recognized as feeding at less than adequate levels for child growth and development, and recurrent infections, including diarrhea, resulting mainly from ingestion of contaminated foods. As a result, many young children, particularly between six months to two years of age, experience weight loss and impaired growth and development. Studies by investigators in various countries have concentrated on traditional food preparation methods and have resulted in offering cheap and practical answers to these problems based on familiar, indigenous and culturally acceptable home processing practices. Two such answers have arisen. Firstly, cereal fermentation is used for reducing the risk of contamination under the existing inappropriate conditions for food preparation and storage in many households. Secondly, a tiny amount of sprouted grains flour is used in preparation of weaning foods as a magic way to lessen the viscosity without decreasing energy density. A method to eliminate pathogenic (致病的) bacteria and inhibit their growth during storage of weaning preparations can benefit nutrition and health in young children considerably. Use of fermented foods for feeding children of weaning age appears to be an effective solution. Fermented foods have lower levels of diarrhoeal germ contamination, they are suitable for child feeding, and can be safely stored for much longer periods of time than fresh foods. The practice has been a traditional way of food preservation in many parts of the world. The anti-microbial properties of fermented foods and their relative higher safety—documented since the early 1900's—have been indicated in a number of studies. In Ghana, it is common to ferment maize dough before cooking it as porridge. In Kenya, cereal-based porridge and milk are traditionally fermented. Preserving milk in the form of yogurt has been known to many households living in hot climate. What are the underlying mechanisms by which fermentation processes help to prevent or reduce contamination? A possible answer suggests that during the fermentation process foods become more acid. This explains why diarrhea-causing bacteria are not able to grow in fermented foods as rapidly as in unfermented ones. It is also hypothesized that some of the germs present in the foods are killed or inhibited from growing through the action of antimicrobial substances produced during fermentation. The fermented foods can, therefore, be kept for a longer time compared to fresh ones. It has been shown that while contamination levels in cooked unfermented foods increase with storage time, fermented foods remain less contaminated. Whatever the underlying mechanisms, the fact is that the exercise reduces contamination without adding to the household cost both in terms of time and money. Its preparation is easy. The cereal flour is mixed with water to form a dough which is left to be fermented; addition of yeast (酵母), or mixing with a small portion of previously fermented dough is sometimes needed. The dough can then be cooked into porridge for feeding to the child. Although beneficial, unfortunately the practice is going out of fashion, partly because of current emphasis on the use of fresh foods, particularly for children. For example, a study on the use of fermented foods for young children in Kenya, demonstrated that while foods are still frequently fermented at home for child feeding, their use is becoming less popular, particularly in urban area where commercial products are more available. Clearly they now need to be promoted.{{B}}Directions:{{/B}} The statements below relate to the passage you have just read. Identify whether they are TRUE or FALSE and mark the corresponding letter (T for True and F for False) on the Answer Sheet with a single line through the center.

单选题Mum: Let's go and see grandma some time during the break. Daughter: Great. What time? Mum: ______ A. You name it. B. Are you ready? C. During the break. D. Take your time.

单选题In the last ten years, the Internet has opened up incredible amounts of information to ordinary citizens. But using the Internet can he like walking into a library where the books are all lying on the floor in piles. While tools like Google allow some structured search, much of the data from such searches is outdated or of questionable value. Some web enthusiasts have taken up the task of organizing information through a democratic means that only the Internet allows: an encyclopedia of the people, by the people, and completely free to copy and distribute. This ‘people’s encyclopedia’ of the Web — a free site called Wikipedia — has provided a unique solution by inviting individuals to participate in the process of rationalizing and updating web content. At the heart of this movement are wikis, web sites that allow users to directly edit any web page with one click of the mouse. Wikipedia — the largest example of these collaborative efforts — is a functioning, user-contributed online encyclopedia that has become a popular and highly regarded reference in just three years of existence. The goal of Wikipedia was to create an encyclopedia that could he shared and copied freely while encouraging people to change and improve the content. Each and every article has an “Edit this page” button, allowing anyone, even anonymous passersby, to add or delete any content on the page. It seems like a recipe for disaster and chaos, but it has produced surprisingly credible content that has been evaluated and revised by the thousands of international visitors to the site. For many, it finally realizes the original concept of World Wide Web creator Tim Berners-Lee — an online environment where people not only browse content, but freely and actively exchange information. The Wikipedia project was started by Jimmy Wales, head of Internet startup Bomis.com, after his original project for a volunteer, hut strictly controlled, free encyclopedia ran out of money and resources after two years. Editors with PhD degrees were at the helm of the project then, but it produced only a few hundred articles. Not wanting the content to languish, Wales placed the pages on a wiki website in January 2001 and invited any Internet visitors to edit or add to the collection. The site became a runaway success in the first year and gained a loyal following, generating over 20,000 articles and spawning over a dozen language translations. After two years, it had 100,000 articles, and in April 2004, it exceeded 250,000 articles in English and 600,000 articles in 50 other languages. Over 2,000 new articles are added each day across all the various languages. And according to website rankings at Alexa.com, it has become more popular than traditional online encyclopedias such as Britannica.com and is one of the top 600 most heavily visited websites on the internet.

单选题This summer, for the first time, Emory College let freshmen pick their own roommates in an online roommate-selection system that works on the same principles as computer dating. Students, using screen names to hide their identities, posted profiles of themselves detailing personality attributes, work habits, music and food preferences, and answers to questions like whether they hoped to "do almost everything" with their roommate or "lead separate but compatible lives. " Roommate-matching is a summer ritual that plunges college housing offices into the most intimate realm of sleep patterns, cleaning habits, and noise tolerance. Online matching is on the cutting edge. Housing officials at Emory, in Atlanta, say they expect that letting students pick their own roommates will increase the likelihood of compatibility. And there's little risk of hurt feelings if the e-mail exchanges do not lead to a match, since the initial round of contacts is done under screen names. Several studies have shown that roommates have an impact on the attitudes and social behavior of those they live with. And one recent study found that a roommate's academic performance has a small, but statistically significant, effect on the other roommate's grade-point average. Other studies, however, did not find that effect. The business of assigning roommates varies widely across the country. At Davidson College, the housing staff sort every freshman with careful hand-selection. The Davidson philosophy is that roommates should be as similar as possible, while halls should be as diverse as possible. "We had a match that seemed perfect, until we discovered that one was a cattle rancher's son and the other was a vegan (绝对素食者) ," said Ms. Kromm. "They should definitely meet, on the same hall. But we didn't want to put them in the same room. " Occasionally, an incoming student asks to be paired with an Asian, or says she might not be able to get along with a Republican. In such cases, Ms. Kromm will remind them that Davidson does not accept roommate preferences based on race, ethnicity, and religion. Davidson's care in matching pays off. " By Christmas last year, we had only four requests for roommate changes out of 480 students. " No one knows whether computer-matching works as well. But at Emory, so far, student reaction seems to be telling something: the online system is overwhelmed with clicks.

单选题A great number of houses would have to be removed to Umake way for/U the new amusement park.