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路由汇聚(Route Summarization)是把小的子网汇聚成大的网络，下面4个子网： 172.16.193.0/24、172.16.194.0/24、172.16.196.0/24和172.16.198.0/24，进行路由汇聚后的网络地址是(25)。
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A young man hurried into his town library. He went up to one of the old librarians and said to her eagerly ,"Do you remember that you persuaded me to borrow a book about Greek history a week【21】？"
"Yes, that' s【22】. "answered the librarian.
"Do you remember the name of the【23】. me young man asked. The librarian【24】very proud, because she was always【25】to get young people to take out books about Greek history, and she【26】found one who was willing to accept her suggestions.
"Yes, "she answered. "Do you want to take it【27】again？ Did you think that it was so interesting？"
"No, of course not." Said the young man, "but when I was taking it【28】. I met a girl on the bus. and I【29】her telephone number in the book. I want to【30】her, so may I look at the book again？"
(56)
Most physiologists deal with reduction. Phenomena are explained in terms of simpler phenomena. For example, the movement of a muscle is explained in terms of changes in the membrane of muscle cells, entry of particular chemicals, and interactions between protein molecules within these cells. A molecular biologist would "explain" these events in terms of forces that bind various molecules together and cause various parts of these molecules to be attracted to one another.
Like other scientists, physiological psychologists believe that all natural phenomena--including human behavior---are subject to the laws of physics. Thus, the laws of behavior. can be reduced to descriptions of physiological processes.
How does one study the physiology of behavior？ Physiological psychologists cannot simply be reductionists. It is not enough to observe behaviors and correlate them with physiological events that occur at the same time. Identical behaviors, under different conditions, may occur for different reasons, and thus be initiated by different physiological mechanisms. This means that we must understand "psychologically" why a particular behavior. occurs before we can understand what physiological events made it occur.
What does the passage mainly discuss？
You're alone, driving on a deserted stretch of highway. Suddenly you are enclosed by clouds of smoke and steam as the engine-temperature light flashes its red warning. You pull over to the slow lane and switch on the four-way emergency flashers. Then what？ Should you keep on rolling or get off the road as fast as you can safely do so？Knowing what is happening and what to do in a car emergency can save time, money, worry--even your life.So learning how to check your car will help you handle some common car emergencies.
The engine's bearings must constantly be lubricated (使润滑) by oil that circulates under pressure. When the oil pressure drops too low, the engine begins to self-destruct. The red oil-pressure warning light flashes on. Listen for any knocking, and sign of serious trouble. If the warning light flashes only at highway speeds and goes out at low speeds or while the engine idles, chances are' the engine is just slightly low on oil. If the light goes on at idle, but goes out when you accelerate, drive slowly to the repair shop. It is a matter of minutes after oil pressure drops that serious engine damage occurs. You could destroy the engine.
The engine temperature warning light signals that the engine is running hotter than normal. Switching on your heater at the first sign of overheating may help delay a boilover--by drawing off some of the excess heat. Reducing speed may also help. If the light goes out, proceed to the nearest service station for help. If too much coolant has been lost, the engine will boil over, surrounding the engine with steam. If this happens, pull completely off the road, stop and wait. Don't rush out and open the hood (发动机翼) in the steam. Wait until the vapor goes away and the engine metal cools. But remember that this can take a few hours on a hot summer day.
From the situation described in the first paragraph, we know that ______.
In only two decades Asian Americans have become the fastest-growing U. S. minority (少数民族). As their children began moving up through the nation's schools, it became clear that a new class of academic achievers was emerging. Their achievements are reflected in the nation's best universities, where mathematics, science and engineering departments have taken on a decidedly Asian character. This special liking for mathematics and science is partly explained by the fact that Asian-American students who began their educations abroad arrived in the U.S. with a solid grounding in mathematics but little or no knowledge of English. They are also influenced by the promise of a good job after college. Asians feel there will be less unfair treatment in areas like mathematics and science because they will be judged more objectively. And the return on the investment in education is more immediate in something like engineering than with an arts degree.
Most Asian-American students owe their success to the influence of parents who are determined that their children take full advantage of what the American educational system has to offer. An effective measure of parental attention is homework. Asian parents spend more time with their children than American parents do, and it helps. Many researchers also believe there is something in Asian culture that breeds success, such ideals that stress family values and emphasize education.
Both explanations for academic success worry Asian Americans because of fears that they feed a typical racial (种族的) image. Many can remember when Chinese, Japanese and Filipino immigrants (移民) were the victims of social isolation. Indeed, it was not until l952 that laws were laid down giving all Asian immigrants the right to citizenship.
While making tremendous achievements at college, Asian-American students ______.
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