TPO8-3
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?
答案选D,相信有疑问的就是C项吧, 首先我个人观点, 原文中的crater这句并不是scientists believe,而且文中说道in southern highlands, 并没有说在Mars是怎样的,文中具体是在说一个现象而不是在预估数字,所以C项错误。