题目内容
It happens to us all, however hard we may try to delay the process—we grow old. Surgery may remove wrinkles (皱纹), skin which has become less firm may be tightened by a surgical operation on the face, and hair-dressers may dye grey hair a more youthful color, but we cannot remain young forever. Advances in medicine have made it possible for more people to stay alive longer. However, what is important is the quality of life, and people age differently. Some people remain quite well and able to look after themselves when they get old, but others of the same age are not so lucky. They have to go into a nursing home in order to receive adequate care. The worst aspect of ageing is that often the mind becomes less alert. As people grow older, they often experience loss of short-term memory, although they may well be able to recall quite easily events that happened long ago. Later they may suffer from dementia (痴呆), a disease which gets gradually worse. By no means all elderly people are in this category. Many senior citizens are in possession of all their faculties and see retirement as a time of freedom. Not only that, if they have a generous retirement pension, they are likely to be quite well off, with money to spend on holidays and other luxuries. Because of this, both businesses and government have a new respect for what is known as grey power. By no means, however, does everyone treat OAPs with respect. There are some culture which are noted for the great respect with which they treat their old people, but many people in other cultures regard the old people as having a very low status in society and treat them accordingly. They often consider old people as having one foot in the grave. Someone should remind them that they, too, will be old one day. According to the author, how people threat the elderly relates to ______.
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试述上皮细胞侧面都有哪些细胞连接？（2分）
Ants first captured the attention of software engineers in the early 1990s. A single ant cannot do much on its own, but a group of ants (51) can solve complex problems. That inspired people like Marco Dorigo, who is one of the founders of a (52) known as group intelligence. Ants are good at choosing the shortest possible route between a food (53) and their nest. This reminds us of a classic computational travelling-salesman problem. Given a list of cities and their (54) apart, the salesman must find the shortest route needed to visit each city once. As the number of cities (55) , the problem gets more complicated. Ants solve their own problem using chemical signals called pheromones (信息素), when an ant finds food, she takes it back to the nest, (56) a pheromone trail that will attract others. The more ants that (57) the trail, the stronger it becomes. (58) , the pheromones evaporate (挥发) quickly, so once all the food has been collected, the trail soon goes cold. This rapid evaporation means long trails are less (59) than short ones, all else being equal. Pheromones thus turn the (60) intelligence of the individual ants into something more powerful.
Purkinje cell
Who says your job leaves you no time to hit the gym A detailed new study of U. S. physical activity patterns shows that men who work full-time—whether their jobs are active or sedentary— end up getting more exercise than healthy working-age men without a job. The new study comes from researchers at the National Institutes of Health (NIH). As part of the National Health and Nutrition Examination Survey in 2003, some 1,800 working-age adults were asked questions about their lifestyle and work habits, and, most importantly, they then agreed to wear an accelerometer—a device to measure their physical activity—over the course of several days. Those data from the accelerometers provide a rare opportunity to nail down how much activity the typical American actually does. They show that men or women who work in active jobs do more physical activity on weekdays than men or women working in sedentary jobs: that’s perhaps not surprising, but the NIH researchers suggest that it still matters because of an ongoing shift in the economy toward sedentary work. The more surprising finding is the one that compares full-time workers to people who don’t work. The study shows that men with full-time jobs do more physical activity than healthy men without jobs. ("Healthy men", in this case, were those men who said their primary reason for being out of work—was something other than health or disability.) In fact, even sedentary full- time workers performed more weekday physical activity overall than the healthy non-workers. The results looked very different for women. Women in sedentary jobs did less physical activity on weekdays than their healthy non-working peers. So what drives the gender (性别) difference The study looks at the pattems, and unfortunately can’t provide too much detail about their causes. There could be many possible answers, including, perhaps, different abilities to pay for leisure time activities or different attitudes about work and physical activity. It could also be that more non-working women than men are choosing to be at home running around full-time after the kids. But the NHK researchers do find evidence, they write, to suggest that, whatever causes the difference, healthy non-working women "are replacing work with active pursuits whereas" —for some reason— "non-working men generally are not. \ The study tries to identify ______.
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