TPO 25 阅读第1篇 第10题In paragraph 4, why does the author point out that Mars has ...为什么答案是

TPO 25 阅读第1篇 第10题In paragraph 4, why does the author point out that Mars has ...为什么答案是

原文提到 Mars has few ancient craters that are less than 5 kilometers in diameter 之后，马上指出 Martian atmosphere 带来的 erosion 比 meteoritic impacts 还大。less than 5 kilometers in diameter 是 atmosphere 带来 erosion 比 meteoritic impacts 大的表现。因此，选项 C 正确，支持了这个说法。选项 A B C 都不对，less than 5 kilometers in diameter 解释不了 the surface is mostly dust ，也解释不了 created by meteoroids 和 fewer ancient impacts。