2. 外语
  3. What does the passage mainly discuss? According to the passage, what is believed to cause the thin lines seen on Europa’s surfa

What does the passage mainly discuss? According to the passage, what is believed to cause the thin lines seen on Europa’s surfa

admin2005-01-30  71
问题 What does the passage mainly discuss?
According to the passage, what is believed to cause the thin lines seen on Europa’s surface?
选项 A、A long period of extremely high tides
B、Water breaking through from beneath the surface ice
C、The continuous pressure of slush on top of the ice
D、Heat generated by the hot rocky core
答案B
解析
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