扫描二维码，直接登录
题库 / GMATAdvanced-CR-2
Recent observations suggest that small, earthlike worlds form a very low percentage of the planets orbiting stars in the galaxy other than the sun. Of over two hundred planets that astronomers have detected around other stars, almost all are hundreds of times larger and heavier than the earth and orbit stars much smaller than the sun.
Which of the following, if true, would most weaken the above justification of the claim that earthlike worlds form a low percentage of the total number of planets?
There are millions of planets orbiting stars around which astronomers have not attempted to detect planets.
The best current astronomical theories predict that almost all planets around other stars are probably hundreds of times larger than the earth.
A planet orbiting a star similar to the sun would be more likely to be earthlike in size than would a planet orbiting a much smaller star.
The smaller a planet is relative to the star it orbits, the more difficult it is for astronomers to detect.
The observations would have detected any small, earthlike worlds orbiting the stars around which larger planets have been detected.
这题就很搞，发现这种难度大的题，就是在句子表达上做文章，把句子说得复杂，说得隐晦。
因果推理，还出现了统计数据，反驳的话，可以攻击数据样本。
题目的意思是：在银河系里边，除开太阳，类地行星在围绕恒星转的行星里边占很少一部分。就是说在这些行星里边，只有很少一部分跟地球类似。
理由是：找到了200多颗这样的行星，几乎所有的行星都要比地球大。
A 很容易选错。也是说的数据样本有问题，还有好多行星并没有被观察到，的确是有可能导致结论不正确。
D 相比它环绕的恒星，行星越小越难观测到。这样就攻击到了200多颗行星样本的选取有问题，并不是类地行星少，而是有很多类地行星没观测到。比A更能削弱论点。
登录 或 注册 后可以参加讨论