中石油托福历年真题03

教育   2024-05-12 23:47   中国台湾  

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When we accept the evidence of our unaided eyes and describe the Sun as a yellow star, we have summed up the most important single fact about it-at this moment in time.


It appears probable, however, that sunlight will be the color we know for only a negligibly small part of the Sun's history. Stars, like individuals, age and change. As we look out into space, We see around us stars at all stages of evolution. There are faint blood-red dwarfs so cool that their surface temperature is a mere 4,000 degrees Fahrenheit, there are searing ghosts blazing at 100, 000 degrees Fahrenheit and almost too hot to be seen, for the great part of their radiation is in the invisible ultraviolet range. Obviously, the "daylight" produced by any star depends on its temperature; today(and for ages to come) our Sun is at about 10,000 degrees Fahrenheit, and this means that most of the Sun's light is concentrated inthe yellow band of the spectrum, falling slowly in intensity toward both the longer and shorter light waves.


That yellow "hump" will shift as the Sun evolves, and the light of day will change accordingly. It is natural to assume that as the Sun grows older, and uses up its hydrogen fuel-which it is now doing at the spanking rate of half a billion tons a second- it will become steadily colder and redder.


1.What is the passage mainly about?

A.Faint dwarf stars

B.The evolutionary cycle of the Sun

C.The Sun's fuel problem

D.The dangers of invisible radiation


2.What does the author say is especially important about the Sun at the present time?

A.It appears yellow

B.It always remains the same

C.It has a short history

D.It is too cold


3.Why are very hot stars referred to as "ghosts"?

A.They are short- lived.

B.They are mysterious

C.They are frightening.

D.They are nearly invisible.


4.According to the passage as the Sun continues to age, it is likely to become what color?

A.Yellow

B.Violet

C.Red

D.White


5.In line 15, to which of the following does "it" refer?

A.yellow "hump"

B.day

C.Sun

D.hydrogen fuel


参考答案:
B A D C C 
参考译文:
当我们仅凭肉眼观察并将太阳描述为一颗黄色恒星时,我们已经概括了关于它的最重要的事实——至少在当前时刻是这样。

然而,似乎太阳光将会是我们所知的颜色只是在太阳历史中极其短暂的一部分。恒星就像个体一样,也会老化和变化。当我们观察太空时,可以看到处于各种进化阶段的恒星。有些是暗淡的血红色矮星,其表面温度仅为4000华氏度;还有些是高达100,000华氏度的炽热幽灵,几乎太热而无法被看见,因为它们的大部分辐射都在不可见的紫外线范围内。显然,任何恒星产生的“日光”都依赖于其温度;今天(并且在未来很长一段时间内),我们的太阳温度约为10,000华氏度,这意味着太阳的大部分光线集中在黄色光谱带上,而在更长或更短的光波长度上强度逐渐降低。

随着太阳的演化,这种黄色的“峰值”将会移动,日光的颜色也将相应改变。我们自然会假设,随着太阳逐渐老化,耗尽其氢燃料(目前的消耗速度高达每秒五亿吨),它将变得越来越冷,越来越红。


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