考博考试

【单选题】Listening out for whale song is one way that ships can avoid colliding with whales.But what do you do if the whales aren’t singing One answer, developed by researchers in theCanary Islands, is to focus on the way the giant creatures mask the clamour of ocean noise.
No one knows how many whales are killed by ships each year, but collisions are thought to ac- count for up to a third of unnatural deaths. For the northern right whale, this means one or two individuals every year, and with only 300 animals left, that’s an unacceptable loss. There are three global hot spots for whale collisions: northern right whales are at risk in theAtlantic off the east coast of the US andCanada, fin whales in the Mediterranean, and sperm whales off theCanary Islands.
Last year, the Massachusetts-based international Fund forAnimal Welfare attached hydro- phones to buoys and successfully listened out for right whale song in the NorthAtlanti
C、But since right whales remain silent for hours at a time, and sperm whales are silent for around haft the time, a better tracking technology is needeD、
The new WhaleAnti-Collision System (WACS), developed by MichelAndre, is designed to help ships in these hot spots steer clear of the whales. It uses a sonar technique called ambient noise imaging to locate the animals even when they are silent.
To do this,Andre has been testing a long lines of buoys, each bristling with 32 sensitive under- water microphones, or hydrophones, that pick up sea sounds such as breaking waves, rain and ship- ping noise.Any approaching whale blocks this background noise and creates a detectable "sound shadow".
By comparing the reflections received from the hydrophones on different buoys,Andre’s system can gather enough information to work out the whale’ s position and how fast it is moving. Software displays the results, on a 3D、colour map. Underwater objects stand out like hot spots on a thermal image. In trials planned for next year,Andre will place two lines of 12 spherical buoys along the 120-kilometre ferry route between the islands of Tenerife and GranCanariA、The signals will be sent to a land station where they will be analysed to create a 3D、picture of the sea in real time.
If the trials are successful, the WACS software could be installed aboard ferries so that ships’ masters can steer clear of whales. Failing that, the whales’ movements could be tracked from shore- based installation and radioed to ships in the areA、
The ambient noise imaging is able to locate the whales even when they are silent because ______.
A、the whales may create detectable "sound shadows"
B、the new sonar equipment is more powerful
C、the new sonar technology can see through sea water
D、the existence of whales may reinforce reflection signals
网考网参考答案：A
网考网解析：
第五段虽然说Any approaching whale．．．creates a detectable“sound shadow’’，但并不是说鲸鱼就制造了声音阴影，而是说它们会对原有声波造成干扰，反映在图谱上就是stand out like hot spots on a thermal image，选项D符合。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>