The basic way to prosperity is to keep superior in every way.

A . hydraulic pumps B . valves C . hydraulic cylinders D . hydraulic motor

A . take B . get C . catch

A . directly increase the pressure of the liquid being pumped B . directly increase the velocity of the liquid being pumped C . convert the potential energy of the liquid to kinetic energy D . separate air from the liquid being pumped

A . Configure the net system - id command under routerisis and enable IS - IS on each interface with the ip router isis command. B . Configure the net sy stem - id and the network net - id commands under routerisis. C . Configure the network net - id command(s) under routerisis and enable IS - IS on each interface with the ip router isis command. D . Configure the network net - id command(s) and the is - type level -1- 2 command under routerisis. E . Configure the net system - id and the network net - id commands under routerisis and enable ISIS on each interface with the ip router isis command.

A . only SAR authorities on land B . all ships in a very large sea area C . the nearest coast stations and port radios D . the SAR authorities ashore as well as ships in the vicinity of the casualty

A . erase the entry and rewrite B . draw several lines through the entry，rewrite，and initial the correction C . completely black out the entry，rewrite，and initial the correction D . draw one line through the entry，rewrite，and initial the correctio

A．put a notebook and pen next to your bed B．try to recall the dreams C．re-enter the previous dreams D．keep a dream journal

A. It's five blocks away B. Walking through the wood C. It's a twenty-minute walk D. Half an hour if we drive fast

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.

A．characters B．components C．catalogues D．collections

A．a plant efficiently utilizes most of the water it absorbs B．carbon dioxide is the essential substance needed for plant development C．a plant needs more water than is found in its composition D．the stronger the wind, the more the water vapor loss

A、of you to tell B、of you telling C、for you to tell D、for you telling

A．基于事实 B．返璞归真 C．脚踏实地 D．固若金汤

A．logos, ethos, pathos B．ethos, logos, pathos C．pathos, logos, ethos D．pathos, ethos, logos

The postal sector is a key contributor to national and international i() (--the basic physical and organizational structures and facilities (e.g.buildings, roads, power supplies) needed for the operation of a society or enterprise)

是 否