难题300：Recent observations suggest that small

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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.

因为没去好好看选项就选了A，请问下NN们，是因为D比A更fatal所以才选D吗？

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小法克Kevin 发表于 2019-10-26 11:20
楼主可以比较A、D的措辞差别

have not attempted to detect

感觉这是一个比较合理的解释，感谢

小法克Kevin

楼主可以比较A、D的措辞差别

have not attempted to detect

difficult for astronomers to detect

一个是主观 一个是客观

杀鸡小能手鸭

D讲的是样本选取的问题，sampling是biased的，因此得出的结论是片面的