TF听力真题XYS_MK_001_Lecture3
MK 001
听力音频链接：
https://mp.weixin.qq.com/s/GL5iEb7pWLOuBibQbVVR3A
L3题目：
1.
What is the lecture mainly about?
A
The discovery of a new moon orbiting Saturn.
B
Methods used to observe the formation of Saturn’s moons.
C
Differences between planet formation and moon formation.
D
A theory about the formation of moons that orbit certain planets.
2.
What is one important point the professor makes about Titan?
A
It was originally a moon of Uranus that was captured by Saturn.
B
It likely originated from the same material as Saturn.
C
Its gravity pulls Saturn’s rings outward.
D
It was produced by the impact of a moonlet colliding with Saturn.
3.
According to the professor, what had astronomers been unable to account for until recently?
A
The reason for the unusual physical composition of Saturn’s moons.
B
The reason that smaller planets do not have multiple moons.
C
The reason for the size and position of many of the moons orbiting Saturn.
D
The reason that Saturn’s moons orbit in a different direction from its rings.
4.
According to the professor, what is significant about the edge of one of Saturn’s outer rings?
A
Saturn’s gravitational pull is weak enough at the edge to allow moonlets to form there.
B
The speed at which material in the ring orbits Saturn varies there.
C
Light reflected by moonlets makes the edge brighter than the rest of the ring.
D
Large objects form beyond Saturn get pulled into the edge of the ring by the ring’s gravity.
5.
According to the new model the professor discusses, what happens to many of Saturn’s moonlets as they move away from the planet？
A
They merge with other moons and become larger.
B
They move increasingly slowly.
C
They are captured back into Saturn’s ring system.
D
They are struck by other bodies and get broken up.
6.
What is the professor’s opinion of the idea that the rings of Uranus and Neptune have become fainter due to moon formation?
A
It is the only hypothesis that can account for the degree of faintness observable today.
B
It is a reasonable conclusion to draw, but it should not be considered a complete explanation.
C
It cannot be confirmed until additional moons orbiting Uranus and Neptune are discovered.
D
The evidence suggesting that the rings were once brighter than they are today is not convincing.
