有趣的长难句23
昨天的正确答案是A，原句的意思是从白垩纪末期到新生代开始的岩石层中，许多动植物从化石记录里突然消失不见，再也看不到了。意思是，这些动植物都灭绝了。所以A是正确答案。B的意思是极少中生代的化石幸存下来，改变了主语，所以不对。
今天的题目选自《火星上的流水》一文，答案改正得奇异近似，很容易混淆，应该算一道难题。火星上有水吗？从这篇文章的用词上看，应该是倾向于火星上有水。一般论文中，赞成者用“proponent”，反对者用“opponent”，很少在学术论文中看到对反对者用“detractor”一词，这个词的词义有点重。
But detractors maintain that the terraces could also have been created by geological activity, perhaps related to the geologic forces that depressed the Northern Hemisphere far below the level of the south, in which case they have nothing whatever to do with Martian water.
Which of the sentences below best expresses the essential information in the highlighted sentence in the passage?
A. But detractors argue that geological activity may be responsible for the water associated with the terraces.
B. But detractors argue that the terraces may have been formed by geological activity rather than by the presence of water.
C. But detractors argue that the terraces may be related to geological forces in the Northern Hemisphere of Mars, rather than to Martian water in the south.
D. But detractors argue that geological forces depressed the Northern Hemisphere so far below the level of the south that the terraces could not have been formed by water.
ABCD四个答案哪个是正确的？解答长难句，理清混淆句
