请教TPO8火星文的一道阅读题

坠坠芙蓉影UID：2815408

Paragraph 3 Some scientists speculate that Mars may have enjoyed an extended early Period during which rivers, lakes, and perhaps even oceans adorned its surface. A 2003 Mars Global Surveyor image shows what mission specialists think may be a delta―a fan-shaped network of channels and sediments where a river once flowed into a larger body of water, in this case a lake filling a crater in the southern highlands. Other researchers go even further, suggesting that the data provide evidence for large open expenses of water on the early Martian surface. A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands. The Hellas Basin, which measures some 3,000 kilometers across and has a floor that lies nearly 9 kilometers below the basin’s rim, is another candidate for an ancient Martian sea.

7. All of the following questions about geological features on Mars are answered in paragraph 3 EXCEPT:
○What are some regions of Mars that may have once been covered with an ocean?
○Where do mission scientists believe that the river forming the delta emptied?
○Approximately how many craters on Mars do mission scientists believe may once have been lakes filled with water?
○During what period of Mars’ history do some scientists think it may have had large bodies of water?

不明白的是为什么选C。文章里不是答了吗？：in this case a lake filling a crater in the southern highlands.请教！

蝶飞依依UID：2905269

Paragraph 3 Some scientists speculate that Mars may have enjoyed an extended early Period during which rivers, lakes, and perhaps even oceans adorned its surface. A 2003 Mars Global Surveyor image shows what mission specialists think may be a delta―a fan-shaped network of channels and sediments where a river once flowed into a larger body of water, in this case a lake filling a crater in the southern highlands. Other researchers go even further, suggesting that the data provide evidence for large open expenses of water on the early Martian surface. A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands. The Hellas Basin, which measures some 3,000 kilometers across and has a floor that lies nearly 9 kilometers below the basin’s rim, is another candidate for an ancient Martian sea.

7. All of the following questions about geological features on Mars are answered in paragraph 3 EXCEPT:
○What are some regions of Mars that may have once been covered with an ocean?$ }( B( k  

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○Where do mission scientists believe that the river forming the delta emptied?: q& G" ~: x" F
○Approximately how many craters on Mars do mission scientists believe may once have been lakes filled with water?+ w$ x  S% b4 a
○During what period of Mars’ history do some scientists think it may have had large bodies of water?



原文说的 是a lake filling a crater是为了证明前面说的delta问题 并没有直接说有多少个crater。  C问的是crater that have lakes filling with water，未提及具体信息，所以EXCEPT，其他的选项我觉得在原文总都可以找到对应的语句。

坠坠芙蓉影UID：2815408

嗯，想通了，谢谢！