首页
登录
职称英语
[originaltext] The vast oceans of the world are dark, deep and mysterious pl
[originaltext] The vast oceans of the world are dark, deep and mysterious pl
游客
2023-07-07
85
管理
问题
The vast oceans of the world are dark, deep and mysterious places where eyesight counts for little as soon as you venture very far beneath the surface.
For humans, who live in a world dominated by visual stimuli, to exist in such conditions would be impossible. But for whales and dolphins that live in the ocean or, in the case of a few species, muddy rivers, the darkness is unimportant. What is important to them is sound.
Sound is an efficient way to transmit and sense information, especially as it travels five times faster through water than through air. If humans shout to someone, it is unlikely that they will be heard a kilometre away. But if a whale shouts in an ocean channel, another whale may hear it tens, if not hundreds, of kilometres away.
Whales and dolphins use sound in two ways: for communication and for echolocation. Dolphins and toothed whales communicate through a wide variety of high-frequency sounds.
But as well as using sounds to communicate, toothed whales and dolphins also rely on echolocation to learn about their immediate environment, including prey that might be waiting nearby. They produce intense short broad-band pulses of sound in the ultrasonic range. These clicks are brief, typically less than one millisecond long — but they are repeated many times each second.
Questions 16 to 18 are based on the passage you have just heard.
16. For whales and dolphins, which sense is most important?
17. How much faster does the sound travel in the water than in the air?
18. How do the dolphins and toothed whales communicate?
选项
A、Through a wide variety of high-frequency sounds.
B、Through a wide variety of low-frequency sounds.
C、Through their varied swimming gestures.
D、Through the echolocation.
答案
A
解析
选项中的through…sounds/gestures表明,本题考查做某事的方式。短文中提到,海豚和齿鲸是通过多种高频声音(through a wide variety of high—frequency sounds)来交流的,故答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/2816800.html
相关试题推荐
[originaltext]M:Ican’tgetthiswindowopen.It’sreallystuck.W:Whydon’t
[originaltext]M:Ican’tgetthiswindowopen.It’sreallystuck.W:Whydon’t
[originaltext]M:Ican’tgetthiswindowopen.It’sreallystuck.W:Whydon’t
[originaltext]M:Ican’tgetthiswindowopen.It’sreallystuck.W:Whydon’t
[originaltext]Thecomputervirusisanoutcomeofthecomputerovergrowthi
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
[originaltext]Whenyouturnontheradio,youhearanadvertisement.Wheny
[originaltext]W:Well,John,howwasyourvacation?Didyouvisitalltheplace
[originaltext]M:Hi,Iamgoingdoortodoortonighttotellpeopleaboutthes
随机试题
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
TryToSeeItOurWayAIt’splaytimeatCrownLanepri
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
图a)所示电路中,复位信号、数据输入及时时钟脉冲信号如图b)所示,经分析可知,在
某公司按照“2/20,N/60”的条件从另一公司购入价值1000万的货物,由于资
处于局部受压的砌体,其抗压强度提高是因为( )。A、局部受压面积上的荷载小
A.4 B.3 C.2 D.1
某女,25岁。妊娠7周,近日脘腹胀满,嗳腐吞酸,不欲饮食,舌苔薄白,脉滑。宜选用
()是货币流通管理中的重点。A.现金形式的货币 B.金银 C.
采用定额单价法和实物量法编制施工图预算,都需要做的一项工作是( )。 A.编
最新回复
(
0
)