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问题 单项选择题

我国《合同法》把合同定义为“合同是平等主体的( )、法人、其他组织之间设立、变更、终止民事权力义务关系的协议”。

A．法定代表人

B．公民

C．自然人

D．单位

答案

参考答案：C

解析：[解题要点] P 72～P 73项目合同管理。

单项选择题

剪胀（或扩容）表示的是下列哪种现象？（）

A.岩石体积不断减小的现象

B.裂隙逐渐闭合的一种现象

C.裂隙逐渐张开的一种现象

D.岩石的体积随压应力的增大而逐渐增大的现象
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单项选择题

The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface.

It can be inferred from the passage that the sun ______ .

A．is approximately halfway through its life as a yellow dwarf
B．has been in existence for 10 billion years
C．is rapidly changing in size and brightness
D．will continue as a yellow dwarf for another 10 billion years
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