题目内容
Why does Mary write to Lucy？
查看答案
搜索结果不匹配？点我反馈
更多问题
【C7】
It is hard to track the blue whale, the ocean's largest creature ,which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when, with the help of the Navy ,they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy's formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies.
Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.
The speed of sound in water is roughly one mile a second-slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope(听诊器) does when it carries faint noises from a patient's chest to a doctor's ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
The passage is chiefly about ______.
听力原文：W: Good evening. I'm Roseanne, your flight attendant. Welcome aboard.
M: Hello, I've got seat A 6. I hope it's by a window so that I can see the view.
Where did this conversation probably take place？
He rose up, grinding his teeth, pale and with fury in______looks.
微信支付 
支付宝支付