首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
It is hard to track the blue whale, the ocean ‘s largest creature, which has almost been killed off by commercial whaling and is
It is hard to track the blue whale, the ocean ‘s largest creature, which has almost been killed off by commercial whaling and is
admin
2022-06-23
43
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 part of 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(爆发) for the first time and that they planned 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.
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B、It has been replaced by a more advanced system.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 for protecting endangered species.
答案
A
解析
根据第三段“…just opening to civilian scientists after the Cold War as the Navy starts to share part of its global network of underwater listening system…”可知,冷战之后,美国海军开始和民间科学家分享其部分水下监听系统,即民间科学家现在可以使用部分美国海军的水下监听系统。其他三项在文中并未提及。故选A。
转载请注明原文地址:https://kaotiyun.com/show/6tQD777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
如何认识人民群众在历史发展中的决定性作用?
Manyayoungpersontellsmehewantstobeawriter,Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff
Studentswithfinancialproblemsaretroubledbyhightuition________.
Ididn’tknowanythingaboutanyofthebookssomychoicewasquite________.
Vitaminsareimportanttoourhealth.Differentvitaminsarefoundindifferentfoods,grains,vegetablesandfruits,fishandm
Collegeisaplacetoexploremanypossibilities:youreallycan’Idothemall—unlessyoumanageyourtimewisely.Herearesom
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportantquestio
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportantquestio
Laptopsarenowsoexpensive________beyondthereachofalmosteveryone.
A.adoptedB.servedC.describedD.prescribedE.inevitablyF.automaticallyGprimarilyH.stopI.adaptedJ.
随机试题
Iworkforagroupthatserveschildrenwithdisabilities.Iloveitandaparticular【C1】______todaymakesmeloveitevenmore.
下列关于髓腔形态描述错误的是
善治胃寒呕吐的药物是
以下属于向海关申报时需要提交的基本单证的是()。
A公司为一综合性的生产企业,增值税一般纳税人,适用增值税税率17%。2009年12月发生的下列事项,请按业务顺序分析流转税的处理(计算过程及结果四舍五人保留两位小数):(1)当月按分期收款合同应取得销售款60000元,月底仍未支付;(2)2
贷款安全比率的合理区间(包括房贷)是()。
神经衰弱的患者精神易兴奋不包括()。
In1924America’sNationalResearchCouncilsenttwoengineerstosuperviseaseriesofindustrialexperimentsatalargeteleph
试分析国际主义风格和现代主义设计风格的联系与区别
下列对802.1lb无线局域网的多峰窝漫游工作方式的描述中,错误的是()。
最新回复
(
0
)