2. 外语
  3. The passage focuses on comets primarily in terms of their Why does the author mention the Giotto probe in paragraph 3?

The passage focuses on comets primarily in terms of their Why does the author mention the Giotto probe in paragraph 3?

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问题  The passage focuses on comets primarily in terms of their
  Why does the author mention the Giotto probe in paragraph 3?
选项 A、It had a relatively small and inconspicuous nucleus.
B、It was very similar to an asteroid.
C、It was covered with an unusual black dust.
D、It provided visual evidence of the makeup of a comet’s nucleus.
答案D
解析
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