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
外语
The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed
The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed
admin
2010-08-04
15
问题
The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed to have lived between I million and 5 million years ago and thought to have been 52 feet long. It is (or was) a shark that had a jaw 7 or more feet wide. Fairly recently, there has been some speculation about whether it is extinct or just out of reach. But few people believe that Megalodon has found a home deep in the ocean.
There are many known "Living Fossils": Coelacanth, Sea Cucumbers, Sea Urchins, Lobsters, Sea Stars. The common ones like lobsters and sea urchins are not really looked on as anything amazing. They’ve been around for thousands of years or more, and axe easily accessible to us. What if they weren’t accessible and yet still existed? We would label them extinct. The discovery of a live Coelacanth, a fish long believed extinct, challenged some scientists’ long-held beliefs on extinction. There have been recent discoveries Of incredibly large squid, and deep-sea fish never before seen by scientists.
In the 1960s the U.S. Navy set up underwater microphones around the world to track Soviet submarines. The network, known as the Sound Surveillance System, still lies deep below the ocean’s surface in a layer of water known as the "deep sound channel’. The temperature and pressure of the channel allow sound waves to travel undisturbed. NOAA’s Acoustic Monitoring Project has been using the Sound Surveillance System to listen for changes in ocean structure like ocean currents or volcanic activity. Most of the sounds recorded are common and of no concern. One sound, identified in 1977 by U.S. Navy "spy" sensors, was odd. It was obviously a marine animal but the call was more powerful than any of the calls made by any other reported sea creature. It was too big for a whale. Could it be a deep-sea monster? One possibility was a giant squid, but no one is sure. It was named "Bloop". Could it be Megalodon? If Megalodon is still alive down in the bottom of the ocean, we may some day soon discover it. Then what? Deep sea diving will never be the same, that’s for sure!
Why did the U.S. Navy set up underwater microphones around the world in the 160s?
选项
A、To listen for changes in ocean structure.
B、To listen for changes of ocean currents or volcanic activity.
C、To make sure whether there was a giant squid deep in the ocean.
D、To follow the track of the Soviet warships under water.
答案
D
解析
细节题。文章第三段第一句指出,为了追踪苏联的潜水艇,美国海军在20世纪60年代在世界范围内布下了水下扩音器,由此可知D正确。
转载请注明原文地址:https://kaotiyun.com/show/J0A7777K
0
大学英语四级
相关试题推荐
AlbertEinsteinBornin1879,inUlm,Germany,EinsteinwastwoyearsoldwhenhisparentsmovedtoMunich.Therehisfather
Degrees,ButNoJobsChina’suniversitygraduatesarefacingthetoughestjobmarket.ByJuneonlyhalfofthecountry’s200
Throughaseriesofexperiments,anAmericanscientisthasobtainedanunderstandingofthesocialstructureofthemostcomplex
MakeaMummyTombIntroductionAncientEgyptiansbelievedinlifeafterdeath.WealthyEgyptiansmadecarefulpreparatio
Theuseofchemicalsinalmostallareasoflifehasbecomeacommonplacephenomenon.Thereisgrowingevidence,however,thatc
A、Thecityisatouristattraction.B、MostvisitorsgotothecitytoseetheBritishMuseum.C、BuckinghamPalaceisthemostat
A、Staffwhospecializeinheatinglosshavebeenhired.B、Thenoisemadebythetrafficnearthecenterhasbecomeworse.C、Ani
A、Amajorsearchengine.B、Amarketingsalescompany.C、Amoneyfundinginstitution.D、Awebsiteowner.A由短文开头第二句aprogramcalle
A、Itslowpurchaseprice.B、Itswideavailability.C、Itsgoodnutritionalvalue.D、Itshigherwatercontent.C推理判断题。本题关键句为“Isup
NorthPoleExplorationsIfSantaClansreallydoesresideattheNorthPole,hemustlivealonelylife.TheNorthPoleisn’
随机试题
简述常见的犯罪阻却事由。
糖皮质激素的适应症不包括
依据《劳动防护用品监督管理规定》的规定,劳动防护用品生产企业必须具备的条件包括()。
下列内容中,()属于锅炉最大连续蒸发量试验的内容。
商品经济是社会主义经济的()。
下列选项中,说法正确的是()。
对于多细胞生物而言,下列有关细胞生命历程的说法正确的是()。
下列成语使用不正确的一项是()。
教师在求知和传授知识和学问的过程中要做到严密谨慎、严格细致。这就要求教师必须()。
theclimateaffectsthefuturesustainableagriculturaldevelopment?pollutioncontrolneedsthesupportoftechnologyandtech
最新回复
(
0
)