L2:
1. What does the professor mainly discuss?
A.The main achievements of the Voyager spacecraft mission
B.Differences between Uranus and other gas giant planets
C.Reasons for the increasing interest of scientists in the planet Uranus
D. Characteristics of Uranus learned using a variety of methods
2. Why does the professor mention the color of Uranus?
A.To give an example of a feature that Uranus shares with Jupiter
B.To give an example of a discovery made by the Voyage spacecraft mission
C.To explain how a component of Uranus’ atmosphere was identified
D.To explain how sunlight affects temperatures on Uranus
3. According to the professor, how did astronomers deduce the composition of the planet Uranus?（多选题）
A.By calculating Uranus’ density
B.By measuring Uranus’ force of gravity
C.By examining the strength of Uranus’ magnetic field
D.By comparing Uranus with Jupiter
4. What features of Uranus do some astronomers think were caused by the planet’s collision with another object?（多选题）
A.The composition of its core
B.The angle of its axis of rotation
C.Its rapid rotation
D.Its low internal temperature
5. Why does the professor mention Uranus’ magnetic field?
A.To point out a surprising similarity between Uranus and Earth
B.To emphasize the limitations of remote observations in astronomy
C.To point out a recent discovery about Uranus that contradicts earlier findings
D.To explain one effect of Uranus’ distance from the Sun
6. Why does the professor say this
A.To suggest that the student’s question reflects a common misconception
B.To remain the student that they will discuss rocky planets in the next class.
C.To help the student realize the answer to his own question
D. To encourage the student to clarify what he means
