2. 外语
  3. Viewed from a star in some other corner of the galaxy, Earth would be a speck, a faint blue dot hidden in the blazing light of o

Viewed from a star in some other corner of the galaxy, Earth would be a speck, a faint blue dot hidden in the blazing light of o

admin2015-01-09  61
问题     Viewed from a star in some other corner of the galaxy, Earth would be a speck, a faint blue dot hidden in the blazing light of our sun. While our neighbors Venus and Mars would reflect a fairly even glow, Earth would put on a little show. Earth’s light would brighten and dim as it spins, because oceans, deserts, forests and clouds-which are all too small to be seen from such a distance—reflect varying arnounts of sunlight. The variations, it turns out, are so strong and distinctive that surprising amount of information could be taken from a simple ebb and flow of light. Scientists at Princeton University andthe Institute for Advanced Study conducted a detailed study of Earth’s reflections as a way for human scientists to learn about distant planets that may be like our own.
    "If you looked at our solar system from far away, and you looked at the terrestrial planets—Mercury, Venus, Earth and Mars—one of the quickest ways to see that Earth is unique is by looking at the light curve," said Ed Turner, professor of astrophysics and a co-author of the study. "Earth has by far the most complicated light curve." The standard thinking in the field had been that most of the information about an Earth-like planet would come from spectral analysis, a static reading of the relative component of different colors within the light, rather than a reading of changes over time. Spectral analysis would reveal the presence of gases such as water vapor, carbon dioxide and oxygen, in the planet’s atmosphere, kooking at the change in light over time does not replace spectral analysis, but it could greatly increase the amount of information scientists could learn, said Turner. It may indicate, for example, the presence of weather, oceans, ice or even plant life.
Which of the following statements is TRUE?
选项 A、Scientists at the Princeton University want to find that distant planets are like our Earth.
B、Among all the terrestrial planets Earth’s light curve is the most complicated.
C、Spectral study of the light will see no development of itself because it is static.
D、Spectral reading is used as a supplementary method to the study of the change in light over time.
答案B
解析 本题应选B。大意是地球的光变曲线是太阳系中最复杂的，依据原话是“Earth has by far the mostcomplicated light curve．”在第一段最后一句话提到：普林斯顿大学和高级研究协会的科学家对地球的光线进行了详细研究，把这作为人类科学家了解类似于地球的遥远星球的一种方法，所以A项不正确，而选项C、D在文中并没有提到。
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