as various as the sands of the sea

A . A、MIDSHIPS B . B、HARD-A-PORT C . C、STEADY D . D、STEADY AS SHE GOES

A . interlocked B . interconnected C . interfered D . interacted

A . IP ToS of 0xEF B . IP experimental ECN C . DSCP decimal 5 D . Binary value of 101110

A . displacement B . fumigation C . discharging D . compensatio

A . Switches B . panels C . alarm units D . safety device

A . permanent magnetism B . subpermanent magnetism C . induced magnetism D . variable magnetism

A.Wingdam B.Towhead C.Cutoff D.Landwall

In a market system individual economic units are free to interact among each other in the market place. It is possible to buy commodities from other economic units or sell commodities to them. In a market, transactions may take place via barter or money exchange. In a barter economy, real goods such as automobiles, shoes, and pizzas are traded against each other. Obviously, finding somebody who wants to trade my old car in exchange for a sailboat may not always be an easy task. Hence, the introduction of money as a medium of exchange eases transactions considerably. In the modern mar ket economy, goods and services are bought or sold for money. An alternative to the market system is administrative control by some agency over all transactions. This agency will issue edicts or commands as to how much of each goods and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of ad ministering such an economy. The central plan, drawn up by the government, Shows the amounts of each commodity produced by the various firms and allocated to different households for consumption. This is an example of complete planning of production, consumption, and exchange for the whole economy. In a traditional society, production and consumption patterns are governed by tradition: parent age, religion, and custom fix every person' s place within the economic system. Transactions take place on the basis of tradition, too. People belonging to a certain group or caste may have an obligation to care for other persons, provide them with food and shelter, care for their health, and provide for their education. Clearly, in a system where every decision is made on the basis of tradition alone, progress may be difficult to achieve. A stagnant society may result. What is the main purpose of the passage？ A．To outline contrasting types of economic systems. B．To explain the science of economics. C．To argue for the superiority of one economic system. D．To compare barter and money-exchange markets.

The pursuit of nothing but economic growth is illustrated by the response of the Japanese government to the American educational mission that visited Japan in 1947. After surveying Japan's educational program, the Americans suggested that the Japanese fill in their curriculum gap by creating departments in chemical and sanitary engineering. Immediately, chemical engineering departments were established in all the country's universities and technical institutions. In contrast, the recommendation to form. sanitary engineering departments was more or less ignored, because they could bring no profit. By 1960, only two second-rate universities, Kyoto and Hokkaido, were interested enough to open such departments. The reluctance to divert funds from production to conservation is explanation enough for a certain degree of pollution, but the situation was made worse by the type of technology the Japanese chose to adopt for their industrial expansion. For the most part, they simply copied American industrial methods. This meant that methods originally designed for use in a country that stretched from the Atlantic to the Pacific with lots of air and water to use as sewage receptacles were adopted for an area a fraction of the size. Moreover, the Japanese diet was much more dependent on water as a source of fish and as an input in the irrigation of rice; consequently discharged wastes built up much more rapidly, in the food chain. Notes: heretic 异教徒。sanitary 卫生的。for the most part 基本上。receptacle 储存地。 According to the text, no measures were resorted to in environmental protection after World War Ⅱ in Japan because _____. A．they were reckoned to be unnecessary. B．they would check economic development. C．no one was much interested in them. D．pollution was held as inevitable at that time.

The puzzle had to do with waves. Though it might seem intuitive that waves carry water to shore, and sand along with it, it's not that simple. The crest(浪尖)of a passing wave lifts a given hit of water upward and landward, but the ensuing trough(波谷) pushes the water back down and Out to sea. Near the bottom, there the sand is, the water was always assumed to just slide back and forth—and the sand with it. "If you take a very aloof look at a beach," says Inman, "you'll realize that if the two motions move sand back and forth the same amount, then all the sand should end up in deep water.' So for beaches to exist, the crest's onshore flow must somehow move enough sand up the beach to counter the seaward tug of both the trough and gravity . The pressure changes in the sand bed, Inman and Conley think, are the key to beach creation. They found that sand doesn't just slide back and forth with each passing wave. Under a trough, it does slide seaward, in a thin layer just above the bottom. But under a crest its movement is often more elaborate. The higher pressure under a crest—higher because the water is piled higher—forces water into the porous(多孔的) sand. This creates strong whirlpools just above the sand, which help loosen it. As the crest passes overhead, the sand first rushes across the bottom; then it abruptly turns violent lifting off the bottom in large, boiling bunches. Finally, just after the crest passes, the sand explodes up into the great water column. The boiling and rushing move more sand than the backsliding under a trough, so there's a net movement of sand toward the shore. What is the primary purpose of this passage？ A．To explain why sand piles up on the beaches. B．To explain why men only prostrate in the sea. C．To propose a new explanation of a phenomenon. D．To refute a misconception.

A．All-IP access network B．broad band network C．NGN D．social network A．data rate B．error rate C．availability D．band width， delay A．mobile communications B．Internet C．All-IP core network D．Fixed Mobile Convergence

A．Right B．Wrong C．Doesn't say

是 否