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He ran away at once _______ he might be seen.
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Although a similar product in plain container might cost less, people often prefer to buy the product in a reusable glass or dish, because they believe the container is free.
Now let us look at how we read. When we read a printed text, our eyes move across a page in short, jerky(断断续续的) movement. We recognize words usually when our eyes are still when they fixate(注视；固定下来). Each time they fixate, we see a group of words. This is known as the recognition span or the visual span. The length of time of which the eyes stop ---the duration(持续) of the fixation(固定，定位) ----varies considerably from person to person. It also varies within any one person according to his purpose in reading and his familiarity with the text. Furthermore, it can be affected by such factors as lighting and tiredness.Unfortunately, in the past, many reading improvement courses have concentrated too much on how our eyes move across the printed page. As a result of this misleading emphasis on the purely visual aspects of reading, numerous exercises have been devised to train the eyes to see more words at one fixation. For instance, in some exercises, words are flashed on to a screen for, say, a tenth or a twentieth of a second. One of the exercises has required students to fix their eyes on some central point, taking in the words on either side. Such word patterns are often constructed in the shape of rather steep pyramids(陡峭的金字塔) so the reader takes in more and more words at each successive(连续的) fixation. All these exercises are very clever, but it"s one thing to improve a person"s ability to see words and quite another thing to improve his ability to read a text efficiently. Reading requires the ability to understand the relationship between words. Consequently, for these reasons, many experts have now begun to question the usefulness of eye training, especially since any approach which trains a person to read isolated words and phrases would seem unlikely to help him in reading a continuous text. The time of the recognition span can be affected by the following facts except ________ .
Internet use appears to cause a drop in psychological health, according to research at Carnegie Mellon University.Even people who spent just a few hours a week on the Internet experienced more bad feelings and loneliness than those who was online less frequently, the two-year study showed. Researchers are puzzling over the results, which were completely contrary to their expectations. They expected that the Net would prove socially healthier than television, since the Net allows users to choose their information and to communicate with others.The fact that Internet use reduces time available for family and friends may account for the drop in psychological health, researchers hypothesized (推测). Faceless, bodiless "virtual"(虚的) communication may be less psychologically satisfying than actual conversation, and the relationships formed through it may be shallower. Another possibility is that exposure(暴露) to the wider world through the Net makes users less satisfied with their lives."But it" s important to remember this is not about the technology, it" s about how it is used," says psychologist Christine Riley of Intel, one of the study" s sponsors (发起人). "It really points to the need for considering social factors in terms of how you design applications and services for technology." Which is NOT true according to the passage
Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose(处理) of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves the opposite problem-how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bulbs(灯泡) and refrigerators as well. The system works so well that no conventional(常规的) fuel is needed to make the campus"s six buildings comfortable.Some parts of most modern buildings-theaters and offices as well as classrooms are more than amply heated by people and lights and sometimes must be air-conditioned even in winter. The technique of saving heat and redistributing it is called "heat recovery." A few modern buildings recover heat, but the University"s system is the first to recover heat from some buildings and re-use it in others.Along the way, pit has learned a great deal about some of its heat producers. The harder a student studies, the more heat his body gives off. Male students emit(发出) more heat than female students, and the larger a student, the more heat he produces. It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hardworking, overweight male genius(天才). According to the passage which of the following would produce the LEAST amount of heat
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