1. What is the main purpose of the lecture?

  • A. To discuss similarities in how Earth’s Moon and IO originally formed 
  • B. To compare and contrast Jupiter’s four Galilean moons 
  • C. To explain why IO differs so greatly from Earth’s Moon 
  • D. To demonstrate how tidal forces affect Jupiter 

2. What discovery by the Voyager spacecraft does the professor mention? 

  • A. IO is volcanically active
  • B. IO has several large impact craters
  • C. IO’s orbit is highly irregular 
  • D. IO is closer to Jupiter than previously thought 

3. What effect of Jupiter’s gravitational force does the professor emphasize? 

  • A. It causes variations in the shape of IO’s surface
  • B. It causes variations in IO’s rate of spin
  • C. It causes ocean levels on IO to rise and fall 
  • D. It keeps the same side of IO always facing Jupiter 

4. What factors does the professor mention that help explain IO’s internal heat?

  • A. Two of Jupiter’s other moons affect IO’s orbit.
  • B. IO still retains much of the internal heat that it had when it formed. 
  • C. Heat radiating from Jupiter is absorbed by IO’s rocky surface. 
  • D. Rock movement in IO’s interior causes friction. 

5. What do the findings of the study of Europa and Ganymede imply? 

  • A. IO’s orbit will gradually become more irregular
  • B. Volcanic activity on IO will eventually decrease
  • C. Jupiter’s gravitational pull on IO will weaken 
  • D. Europa and Ganymede will move closer to Jupiter 

6. Why does the professor say this: 🎧

  • A. To indicate that he does not like to be interrupted
  • B. To confirm the student’s conclusion
  • C. To remind the student that the point was covered in a previous class 
  • D. To indicate that he wanted to change the topic 

答案:C A A AD B B


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