绩效反馈面谈需要达到的目的有( )。A．向员工反馈绩效考核结果 B．向员工传递组织

在5，8，-10，-26，+19，0，-180，690，-10000中，正数有（    ），负数有（    ），（    ）既不是正数也不是负数。

从英国开始的第一次工业革命在各个方面产生了重大影响。英国工业革命发生的直接原因是　　　　　　　　　　　　　　　　　　　　　　 [ ]

A．资产阶级统治建立的需要　　　　　

B．工场手工业向机器生产发展的必然要求

C．增强殖民扩张的实力的需要　　　　

D．不断扩大的市场的需求

The central problem of economics is to satisfy the people’s and nation’s wants. The problem we are faced with is that our (1) , here identified as money, are (2) . The only way we can resolve our (3) is to make choices. After looking at our resources, we must examine our list of (4) and identify the things we need (5) , those we can postpone, and (6) we cannot afford. As individuals, we face the central problem involved in economics — deciding just how to allocate our limited resources to provide ourselves with the greatest (7) of our wants.
Nations face the same problem. As a country’s population (8) , the need for more goods and services grows (9) . Resources necessary to production may increase, but there are (10) enough resources to satisfy the total desires of a (11) . Whether the budget meeting is taking place in the family living-room, in the conference room of the corporation (12) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find (13) of allocating limited resources in order to satisfy unlimited wants.
A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in (14) abundance that economists had no concern about (15) of scarcity and what to do about it. Today many of these "free goods" are in (16) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately pay for the producers’ extra costs, and (17) tax-payers who pay for the government’s involvement in cleaning the environment.
In the 1990s, almost all goods are (18) . Only by effort and money can they be (19) in the form people wish.
Meeting the needs of people and the demands from resources available leads to the basic activity of production. In trying to (20) unlimited wants from limited economic goods, production leads to new problems in economics.

试述农业科技进步的特点？