C1
对话
1. What issue are the speakers mainly discussing?
The student’s research contradicts something the professor said.
The student needs extra time to complete an assignment.
The student needs to find a topic for his paper.
The student recently missed an important class.
2. What happens in a major collision between two galaxies?
The two galaxies combine to form one large galaxy.
The two galaxies temporarily overlap but then separate.
Some of the stars in the galaxies are pushed close together.
One galaxy causes the other to break apart.
3. What does the professor imply about the class textbook?
It is not missing relevant information on galactic collisions.
Its section on galactic collisions is rather unclear.
The experiments it discusses are outdated.
The student should use it to guide his research.
4. What fact explains why collisions between galaxies do not usually result in collisions between stars?
The more violent type of galactic collision is relatively rare.
Stars’ magnetic fields push them away from each other.
Galaxies that collide tend to have fewer stars than normal.
There is plenty of open space in the colliding galaxies.
5. What can be inferred about the student when he says this:
He realizes that he has misunderstood the purpose of the assignment.
He thinks he will have to do more research before he can use the observatory.
He understands that the telescope is probably not powerful enough for his needs.
He doubts he will have enough time to write a paper and use the observatory.
