C2
对话
1. What are the speakers mainly discussing?
How a mixture of chemicals in the soil can stimulate plant growth
How rainfall causes the release of a scent into the air
How petrichor is stored by soil bacteria during dry periods
How certain chemicals in the air affect plants during a rainfall
2. What is the main function of the plant oils mentioned by the professor?
They produce a scent that attracts bees.
They increase the growth of root fibers.
They help protect plant roots from the effects of flooding.
They help prevent other plants from growing nearby.
3. What did researchers observe using high-speed cameras?
Bubbles bursting open and releasing droplets
Oil vapor being released from the leaves of plants
A chemical mixture being released by the roots of the plants
Ozone rising from the soil after a lightning flash
4. What can be inferred about the professor when she mentions the student’s observations about clay?
She is pleased that the student used information from his chemistry class to improve his ceramics work.
She is surprised that the student’s work with clay is so similar to her own work.
She is impressed that the student made a connection between the smell of clay and the smell of the air after a rain.
She is satisfied that the student has done the necessary research on the topic.
5. What does the professor imply when she says this:
The student needs to listen carefully in class discussions about how to select research
topics.
The student’s choices of topics for his research papers have not been appropriate.
The student needs to spend more time on chemistry and less time on ceramics.
The student should consider writing about a process like ozone production.
