不知道今天换不换库，贡献一个逻辑太太乐

alancui

1. 逻辑

文章是PREP的，但是bold的地方不一样


Astronomer: Observations of the Shoemaker-Levi comet on its collision course with Jupiter showed that the comet broke into fragments before entering Jupiter's atmosphere in 1994, but they did not show how big those fragments were. In hopes of gaining some indication of the fragments' size, astronomers studied spectrographic analyses of Jupiter's outer atmosphere.  These analyses revealed unprecedented traces of sulfur after the fragments' entry. The fragments themselves almost certainly contained no sulfur, but  many astronomers believe that the cloud layer below Jupiter's outer atmosphere does contain sulfur.  Since  sulfur would have seeped into the outer atmosphere if comet fragments had penetrated this cloud layer, it is likely that some of the fragments were at least large enough to have passed through Jupiter's outer atmosphere without being burned up.


数学、作文的题目在JJ里都有了，所以就不再贴了