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
23
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
[originaltext]W:Goodafternoon,Mr.White.YouareinmyAmericanHistory201
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesand
下列各项中,不属于企业制度基本内容的是( )。A.企业产权制度 B.企业组织
下列各项中,年金净流量的计算公式正确的有()。A.年金净流量=净现值/年金现值系
【说明】小赵被任命为某软件开发项目的专职质量管理人员,他此前只有过三个月的软件开
28岁初产妇,孕39周,规律宫缩8小时入院,LOA位,胎心率136次/分,宫缩3
治疗外阴炎时,使用1:5000高锰酸钾溶液坐浴的主要作用是( )。A.杀菌
紧缩性的财政政策措施包括( )。[交通银行真题]A.减少政府支出 B.向居民
易发生水解的药物为()A.酚类药物 B.烯醇类药物 C.杂环类药物 D.
下列费用中,属于应在规费清单中列项的有()。A.安全文明施工费 B.工会经费
最新回复
(
0
)