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问题 选择题

二氧化三碳（C3O2）是金星大气层的一个组成部分，下列关于二氧化三碳的说法错误的是

A．C3O2的电子式为：

B．C3O2、CO、CO2都是碳的氧化物

C．C3O2和CO一样可以燃烧生成CO2

D．C3O2和CO2都是碳酸的酸酐

答案

答案：D

单项选择题

Economist: Any country that is economically efficient will generate wealth. Such a country will remain politically stable only if that wealth is distributed equitably. The equitable distribution of wealth puts an end to risk taking, the indispensable precondition of economic efficiency.
Which of the following conclusions can be properly drawn on the basis of the statements above

A．No country can indefinitely remain both economically efficient and politically stable.

B．No country can indefinitely remain both politically unstable and wealthy.

C．Economic efficiency is the indispensable precondition for the generation of wealth in a country.

D．Any country in which wealth is distributed equitably will indefinitely remain politically stable.

E．(E) Growing economic efficiency encourages risk taking, which in turn leads to further growth in economic efficiency.
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多项选择题

参苓白术散的药物组成下列哪些是正确的（）

A.人参、白术、扁豆

B.茯苓、甘草、山药

C.莲肉、桔梗

D.薏苡仁、砂仁

E.当归、白芍
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