L3：
1. What is the main purpose of the discussion?
To describe the design of hydrophones used by hurricane researchers
To introduce a new approach to measuring the power of hurricanes and cyclones
To explain how meteorologists study the causes of hurricanes and cyclones
To discuss factors that determine the wind speed of hurricanes and cyclones
2. According to the professor, what is one benefit of hurricane monitoring airplanes?
They help meteorologists determine the storm’s path.
They can gather all necessary information in just a few flights.
Their equipment is not as sophisticated as a new technology.
They can provide direct measurements of wind speed.
3. What are two advantages of using a hydrophone to measure hurricane intensity?
（多选题）
They can transmit underwater sounds to airplanes.
They can lower the cost of monitoring hurricanes.
They can be setup before a hurricane reaches an area.
They can be installed close to the surface of the ocean.
4. What does the professor imply about the relationship between the two researchers he mentions?
It will likely lead to other breakthroughs in meteorology.
It demonstrates the importance of interdisciplinary collaborations.
It developed over many years of working in the similar field.
It led to the invention of an underwater microphone.
5. Why does the professor mention a hydrophone listening for underwater earthquakes?
To point out the fact the underwa ter earthquakes are hard to detect
To help explain how hydrophones work
To point out that different types of hydrophones exist D. To provide the validation of a new technique
6. Why does the professor say this:
To emphasize the point he made earlier
To find out whether the student agrees with him
To help the student find the answer to his own question
To explain the findings of a new study
