首页
登录
职称英语
It is hard to track the blue whale, the ocean’ s largest creature, which has
It is hard to track the blue whale, the ocean’ s largest creature, which has
游客
2023-11-23
69
管理
问题
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 mug[fly 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 does when it carries faint noise 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. [br] Which of the following is true about the U.S. Navy underwater listening network?.
选项
A、It is now partly accessible to civilian scientists.
B、It has been replaced by a more advanced system.
C、It became useless to the military after the cold war.
D、It is indispensable in protecting endangered species.
答案
A
解析
根据文章第三段中的“...as the Navy starts to share and partly uncover its global network of underwater listening system...”可以看出,军用设备并没有完全向"civilian scientists"开放,所以A 符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3212541.html
相关试题推荐
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,
(1)Howlivingcreaturesevolvehasbeenprettywellunderstoodforthepast
(1)Howlivingcreaturesevolvehasbeenprettywellunderstoodforthepast
(1)Howlivingcreaturesevolvehasbeenprettywellunderstoodforthepast
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
随机试题
【B1】[br]【B19】A、caughtB、heldC、loseD、raisedDraised意为“举起,提高”,本句意为:他举起手以友好的方式表
Our______sensitivitydecreaseswithage.Byage60,mostpeoplehavelost40p
()是汉字基本的外形特征。A.长方形 B.三角形 C.自由形 D.正方形
()产生的内部根源,直接说来在于医务人员的社会性;最终说来在于它攸关自己
流式细胞术中未涉及的技术是( )。A.激光技术 B.计算机技术 C.流体喷
人们经常听到“信息”和“控制”这两个字眼,但往往说不清它们的确切含义。实际上,我
1941年5月,毛泽东在《改造我们的学习》的报告中指出:…实事’就是客观存在着的
人造冠的设计与选择
肉芽肿性唇炎的病理改变为A.上皮角化不全,有脓性渗出或形成脓肿 B.血管周围有
(2017年真题)根据《企业破产法》及相关规定,下列关于和解的说法中,正确的是(
最新回复
(
0
)