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问题 单项选择题

In object-oriented (51) , objects can be viewed as reusable components, and once the programmer has developed a (52) of these components, he can (53) the amount of new coding required. But (52) a (54) is no simple task because the integrity of the Original software design is critical. Reusability can be a mixed blessing for user, too, as a programmer has to be able to find the object he needs. But if (55) is your aim, reusability is worth the risk.

A．complexity

B．creating

C．indisposing

D．library

E．maximize

F．minimize

G．reading

H．procedure

I．productivity

J．programming K. security L. using

答案

参考答案：I

解析：

[分析]： 在面向对象的程序设计中，对象可被看做是一种可重用的构件。一旦程序员开发了一个构件库，就可以使新程序需要的代码数量最小化。但是，建立一个构件库却并非易事，，因为最初的软件设计的完整性是很重要的。当程序员能找到所需要的对象时，对用户来说，可重用性是一个好坏参半的事情。但是，如果效率是你追求的目标，那么可重用性还是值得一用的。

单项选择题

白秃疮的特点是（）

A.相当于西医的黄癣

B.多见于青年人，男性多于女性

C.头发易拔落而且不痛，病发根部包绕有白色鳞屑形成的菌鞘

D.癣痂呈蜡黄色、肥厚，有特殊的鼠尿臭

E.当病愈后头皮留下萎缩性瘢痕
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填空题

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.
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