单选题 Advancing age means losing your hair, your waistline and your memory, right? Dana Denis is just 40 years old, but {{U}}(21) {{/U}} she's worried about what she calls "my rolling mental blackouts." "I try to remember something and I just blank out," she says. You may{{U}} (22) {{/U}} about these lapses, calling them "senior moments" or blaming "early Alzheimer's(老年痴呆症)." Is it an inescapable fact that the older you get, the {{U}}(23) {{/U}} you remember? Well, sort of. But as time goes by, we tend to blame age {{U}}(24) {{/U}} problems that are not necessarily age-related. "When a teenager can't find her keys, she thinks it's because she's distracted or disorganized," says Paul Gold "A 70-year-old blames her {{U}}(25) {{/U}}." In fact, the 70-year-old may have been {{U}}(26) {{/U}} things for decades. In healthy people, memory doesn't worsen as {{U}}(27) {{/U}} as many of us think. "As we {{U}}(28) {{/U}} , the memory mechanism isn't {{U}}(29) {{/U}}," says psychologist Fergus Craik. "It's just inefficient." The brain's processing {{U}}(30) {{/U}} slows down over the years, though no one knows exactly {{U}}(31) {{/U}} Recent research suggests that nerve cells lose efficiency and {{U}}(32) {{/U}} there's less activity in the brain. But, cautions Barry Gordon, "It's not clear that less activity is {{U}}(33) {{/U}} . A beginning athlete is winded(气喘吁吁) more easily than a {{U}}(34) {{/U}} athlete. In the same way, {{U}}(35) {{/U}} the brain gets more skilled at a task, it expends less energy on it. There are {{U}}(36) {{/U}} you can take to compensate for normal slippage in your memory gears, though it {{U}}(37) {{/U}} effort. Margaret Sewell says: "We're a quick-fix culture, but you have to {{U}}(38) {{/U}} to keep your brain {{U}}(39) {{/U}} shape. It's like having a good body. You can't go to the gym once a year {{U}}(40) {{/U}} expect to stay in top form."

单选题 百度(Baidu)是全球最大的中文搜索引擎。2000年1月，李彦宏(Robin Li)和徐勇在北京中关村创立了百度公司，致力于向公众提供“简单、可依赖”的信息获取方式。经过多年的发展，百度已经拥有数千名研发工程师，他们掌握着世界上最为先进的搜索引擎技术。百度已经成为掌握最尖端的核心技术的中国高科技企业之一。百度提供的所有产品操作简单，涉及普通公众工作和生活的各个方面。它已成为中国最受欢迎、影响力最大的中文网站。

单选题 中医(Traditional Chinese Medicine)是中华文化不可分割的一部分，为振兴华夏做出了巨大的贡献。如今，中医和西医(western medicine)在中国的医疗保健领域并驾齐驱。中医以其独特的诊断手法、系统的治疗方式和丰富的典籍材料，备受世界瞩目。中国的中医事业由国家中医药管理局(State Administration of TCM and Pharmacology)负责。现在国家已经出台了管理中医的政策、法令和法规，引导并促进这个新兴产业的研究和开发。在定义上，中医是指导中国传统医药理论和实践的一种医学，它包括中医疗法、中草药(herbology)、针灸(acupuncture)、推拿(massage)和气功(Qigong)。

单选题1．近来电视相亲节目很流行；2．有人反对，有人支持；3．你的观点。

单选题Earthquake belts are ______.

单选题The writer asserts that in design strategies and schemes ______.

单选题Although they are very succinct ——that is why they caught on ——cliches are wasted words because they are ______ expressions rather than fresh ones.

单选题 Questions12-14 are based on the passage you have just heard.

单选题The Greek's lofty attitude toward scientific research—and the scientists' contempt of utility—was a long time dying. For a millennium after Archimedes, this separation of mechanics from geometry inhibited fundamental technological progress and in some areas repressed it altogether. But there was a still greater obstacle to change until the very end of the middle ages: the organization of society. The social system of fixed class relationships that prevailed through the Middle Ages (and in some areas much longer) itself hampered improvement. Under this system, the laboring masses, in exchange for the bare necessities of life, did all the productive work, while the privileged few—priests, nobles, and kings—concerned themselves only with ownership and maintenance of their own position. In the interest of their privileges they did achieve considerable progress in defense, in warmaking, in government, in trader in the arts of leisure, and in the extraction of labor from their dependents, but they had no familiarity with the process of production. On the other hand, the laborers, who were familiar with manufacturing techniques, had no incentive to improve or increase production to the advantage of their masters. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leisure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved. The whole ancient world was built upon this relationship—a relationship as sterile as it was inhuman. The availability of slaves nullified the need for more efficient machinery. In many of the conmonplace fields of human endeavor, actual stagnation prevailed for thousands of years. Not all the glory that was Greece and the grandeur that was Rome could develop the windmill or contrive so simple an instrument as the wheelbarrow—products of the tenth and thirteenth centuries respectively. For about twenty-five centuries, two-thirds of the power of the horse was lost because he wasn't shod, and much of the strength of the ox was wasted because his harness wasn't modified to fit his shoulders. For more than five thousand years, sailors were confined to rivers and coasts by a primitive steering mechanism which required remarkably little alteration (in the thirteenth century) to become a rudder. With any ingenuity at all, the ancient plough could have been put on wheels and the ploughshare shaped to bite and turn the sod instead of merely scratching it—but the ingenuity wasn't forthcoming. And the villager of the Middle Ages, like the men who first had fire, had a smoke hole in the center of the straw and reed thatched roof of his one-room dwelling (which he shared with his animals), while the medieval charcoal burner (like his Stone Age ancestor) made himself a hut of small branches.

单选题We ______ three major snowstorms so far this winter.

单选题I had my eyes tested and the report says that my ______ is perfect.

单选题If you go to the park every day in the morning, you will ____ find him doing physical exercise there.

单选题It is useful to be able to predict the extent _______ which a price change will influence supply and demand.

单选题Conceptual meaning is not______

单选题It was not a serious accident, the car needs only some ______ repairs.

单选题Which of the following most accurately describes the pattern of the passage?

单选题The science teacher Udemonstrated/U the process of turning solid gold into liquid.

单选题Jim was late for two classes this morning. He said that he forgot both of the ______.