题目内容

Common property rights

A. increase efficiency over individual property rights.
B. enable the Coase theorem to work.
C. are responsible for the increasing success of preservation of African elephants.
D. are responsible for the increasing success of preservation of worldwide fishing resources.
E. result in faster depletion of resources than do individual property rights.

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Which of the following move the handling of a common property resource closest to efficiency?

A. ensuring that the sellers of the resource are perfectly competitive
B. ensuring that the seller of the resource is a monopolist
C. banning the sale of the resource
D. banning the use of the resource
E. assigning a usage fee for access to the resource

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Common property resources tend to be

A. overused.
B. underused.
C. not used at all.
D. efficiently used.
E. used by the government only.

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关于原核细胞型微生物的描述,错误的是()

A. 原始核呈环状裸DNA团块结构
B. 无核膜、核仁
C. DNA和RNA同时存在
D. 核酸类型为DNA或RNA,两者不同时存在
E. 细胞器很不完善,只有核糖体

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关于荚膜的叙述,错误的是()

A. 是某些细菌细胞壁外的一层较厚的粘液性物质。
B. 对碱性染料亲和力低,不易着色。
C. 其化学成分都是多糖。
D. 有抗吞噬作用和抵抗体液因子的杀菌作用。
E. 一般在动物体内形成,但在含大量糖类和血清的培养基中也能形成。

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