lose matter, astronomers have concluded that the lifetimes of comets with orbits that bring them near enough to the Sun to be seen from Earth are very much shorter than the age of the solar system.Where do the new comets come from to replace the old ones that dissipate and vanish from ...
托福托福 63 - Structure and Composition of Comets 题目 收藏 6.According to paragraph 3, the tails of a comet A.flow in the same direction as the radiation that produces them B.become straighter as the comet moves away from the Sun
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Structure and Composition of Comets Astronomers now have a fairly good idea of what a comet really is. When it is far from the Sun, it is a very small object only a few kilometers across It consists mainly of ices (water, methane, ammonia) with bits of dust embedded in it-a kind of...
这篇文章是TPO63第二篇文章,欢迎同学们来练习,建议做题时间:18分钟。 参考答案和视频讲解在最后。 参考答案A(BD)DBD ADDAB BAD ADF 视频讲解如果你想系统学习托福阅读的题型技巧,和完备的阅读训练计划+题目…
托福新托福 63 - Structure and Composition of Comets 题目 收藏 1.Which part of a comet is described in the passage as a "dirty ice ball" ? A.The nucleus B.The coma C.The dust tail D.The ion tail 阅读原文中文译文 Astronomers now have a fairly good idea of what a comet really is....
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Since a comet loses matter on each pass by the Sun, eventually it will be depleted to the point where it is no longer visible. Comets that approach the Sun have finite lifetimes. Given the typical sizes of comets and the typical rates at which they lose matter, astronomers have concluded ...