听力音频：
L1：
讲座
1. What is the main purpose of the lecture
To describe some methods and findings of ocean-acoustics research
To compare whale songs with other underwater sounds
To present evidence that climate change is affecting Antarctic ice
To introduce students to the work of a leading ocean-acoustics researcher
2. How does the professor organize the lecture
By describing a relatively new scientific discipline, then explaining how it began
By describing deep-sea biological sounds, then comparing them with geological sounds
By describing some deep-sea sounds, then discussing the challenge of identifying their source
By defining interdisciplinary research, then giving an extended example of how it works
3. According to the professor, what does Christopher Fox believe is the likely source of Slowdown
Airplanes flying low over the ocean
A volcano on the ocean floor
Groups of whales migrating
Ice slipping across land
4. What does the professor think may be an important use of ocean-acoustics research
It may help researchers identify mysterious sounds in other environments.
It may provide new information about climate change.
It may reveal a relationship between earthquakes and underwater volcanoes.
It may help biologists track whales’ migration routes.
5. How do scientists make it possible to hear sounds from the deep sea
By eliminating all low-frequency sounds from undersea recordings
By combining recordings made underwater with recordings made above the water surface
By making a recording in which nothing can be heard, then speeding up the recording
By using a seismometer to identify the sound’s location, then placing a hydrophone there
6. What is similar about Upsweep and Bloop
A. Both vary in frequency from season to season.
Both are audible over long distances.
Both are made by sea animals.
Both are made by geologic forces near islands.
