现发现的西夏王陵共()座。 A.9 B.10 C.11

题型:单项选择题

问题:

现发现的西夏王陵共()座。

A.9

B.10

C.11

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题型:单项选择题

口袋中有形状、大小都相同的2只白球和1只黑球,先摸出1只球,记下颜色后放回口袋,然后再摸出1只球,则“两次摸出的球颜色不相同”的概率是______.

题型:单项选择题

影响龋病患者的因素不包括()

A.饮食习惯

B.地区不同

C.人群的性别、民族差异

D.气候条件

E.年龄差异

题型:单项选择题


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.

题型:单项选择题

以下哪项不是羟丁酸钠静脉麻醉的并发症

A.上呼吸道梗阻

B.血钾升高

C.分泌物增多

D.锥体外系症状

E.苏醒期躁动

题型:单项选择题

商陆的气味是()

A.气微香,味甜

B.气微,味淡,有刺喉感

C.气微,味苦

D.气微,味甘淡,久嚼麻舌

E.微有香气,味微苦涩

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