L1：
1. What is the lecture mainly about
The difficulties in making a recycling process more efficient
Environmental benefits of recycling oil
Reasons for obtaining new sources of oil
A process for creating an environmentally safer oil
2. What does the professor imply about early attempts to convert waste materials into oil?
They were environmentally safer than the thermal depolymerization process.
They used too much water in their production process.
They were generally considered to be unsuccessful.
The sources they used were too expensive to be practical.
3. According to the professor, how does the thermal depolymerization earlier process differ from used to make fuel from waste?（多选题）
Only the thermal depolymerization process mimics the way Earth produces oil.
Only the thermal depolymerization process can utilize both organic and inorganic waste as a source.
The thermal depolymerization process produces oil of a higher quality than earlier processes did
Only the thermal depolymerization process use products that contain carbon as a can use source
4. According to the professor, what role does water play in the thermal depolymerization process?
It reduces the amount of energy that the process requires.
It breaks apart materials at the molecular level.
It converts organic waste into liquid.
It reduces the amount of waste material that the process requires.
5. Why does a student mention global warming and greenhouse gases?
To support the professor’s claim about problems with current levels of crude oil usage
To find out what the original motivation was for the development of thermal depolymerization
To raise a question about the potential environmental impact of thermal depolymerization
To point out an advantage of using inorganic waste to create crude oil
6. What is the professor’s opinion of the thermal depolymerization process becoming a carbon-neutral process?
He thinks it is not likely to occur in the near future.
He thinks it will happen only if the price of oil goes up.
He thinks it will not happen until environmental groups get involved.
He thinks that the amount of untapped oil underground makes a carbon-neutral process unnecessary.
