首页
登录
职称英语
Dolphins (海豚) live their whole lives in water. But they are mamma& (哺乳动物J) th
Dolphins (海豚) live their whole lives in water. But they are mamma& (哺乳动物J) th
游客
2023-10-08
34
管理
问题
Dolphins (海豚) live their whole lives in water. But they are mamma& (哺乳动物J) that live in water. That’ s why a dolphin comes to the top of the water so often. A dolphin’ s nose isn’ t easy to see. It’ s just a tiny hole on top of the dolphin’ s head. This hole is called a blowhole. A dolphin comes up every half minute or so to breathe. It opens its blowhole and takes in air. Then it closes its blowhole tight and dives into the water again. But a dolphin can stay under the water for six or seven minutes if it has to. It holds its breath.
A dolphin hears with two ears. It hears all sorts of small noises under water. It hears small stones rolling. It can hear sounds fish and other dolphins make. A dolphin’s ears may be extra small, but its mouth is extra big. It has to be big. It holds almost one hundred teeth. These teeth are all the same shape and size. They are used for catching food, but not for chewing (咀嚼) it. A dolphin opens its big mouth. It seizes (抓住) a fish firmly between its two rows of teeth. Then it swallows (吞下) the whole fish.
A dolphin swims very fast. It is said that a dolphin swims faster than anything else in the water. So engineers are studying its skin and shape. They are learning ways to make boats go faster through the water.
It is well known that dolphins are very smart. Some scientists say they are smarter than dogs. Others say they are smarter than apes (类人猿).
选项
A、month
B、ears
C、skin
D、blowhole
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3081548.html
相关试题推荐
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[originaltext](17)Sometreescansurvivealongtimewithoutwater.Think
[audioFiles]audio_ehbz20086_002(20086)[/audioFiles]A、Tea.B、Coffee.C、Water.D、
Fishareanimalsthatliveinwater.Theyliveinalmostanyplace【11】there
Fishareanimalsthatliveinwater.Theyliveinalmostanyplace【11】there
Fishareanimalsthatliveinwater.Theyliveinalmostanyplace(11)the
随机试题
Thewaypeopleholdtothebeliefthatafun-filled,painfreelifeequalsha
ReconstructingAncientEnvironmentsP1:Archaeologyisparticularlyimportantfo
GeneralLinguisticsisthescientificstudyofA、languageofcertainindividual.
Atsomepoint,mosthomeownersfindthattheirhomenolongersuitstheirli
Englandisnotabigcountry:fromnorthtosouthandfromeasttowestiti
下列词语中,加下划线的字注音有误的是( )。A.蛮横(hèng) B.哂笑(
下列关于“沪港通”的说法,错误的是()。A.沪股通股票包括以外币报价交易的股票
某县统计局在对统计数据质量进行检查时发现,某乡镇上报的企业数据与企业提供的原始资
中标人无正当理自不与招标人签订物业服务合同,应当()。A:没收中标人的履约保证金
建设项目总概算是由()汇总编制而成。A、单位工程概算 B、各单项工程概算
最新回复
(
0
)