What does the passage mainly discuss? The author mentions "wispy marks" in line 19 as an example of

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问题  What does the passage mainly discuss?
  The author mentions "wispy marks" in line 19 as an example of

选项 A、an aspect of the lunar surface discovered through lunar missions
B、a characteristic of large craters
C、a discovery made through the use of Earth-based telescopes
D、features that astronomers observed to be common to Earth and the Moon

答案C

解析
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