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问题 单项选择题

下列血浆蛋白中可作为机体营养不良指标的是（）

A.结合珠蛋白

B.前清蛋白

C.C反应蛋白

D.铜蓝蛋白

E.转铁蛋白

答案

参考答案：B

解析：前清蛋白在肝细胞中合成，主要作为组织修补材料，是机体营养不良指标之一。

单项选择题

男性，40岁，近1年多来反复上腹部不适、胀痛伴嗳气，无反酸，查体发现上腹轻压痛，胃镜示胃粘膜充血，色泽较红，有水肿，呈红白相间，以红为主，有白色渗出物，偶见出血点和少量糜烂。最可能的诊断是

A．慢性浅表性胃炎

B．慢性萎缩性胃体炎

C．慢性萎缩性胃窦炎

D．慢性肥厚性胃炎

E．腐蚀性胃炎
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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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