题目

共用题干
The Greatest Mystery of Whales
The whale is a warm一blooded,air-breathing animal,giving birth to its young alive,sucking them一and,
like all mammals,originated on land. There are many________________(51)of this. Its front flippers(鳍状肢),
used for steering and stability,are traces of feet.
Immense strength is________________(52)into the great body of the big whales,and in fact most of a
whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated________________(53)
400 horsepower. One specimen was reported to have towed(拖)a whaling vessel for seven hours at the
_______________ (54)of eight knot(节).
An angry whale will________________(55).A famous example of this was the fate of Whaler Essex,
________________(56)was sunk off the coast of South America early in the last century. More recently,steel ships
have ___________( 57 ) their plates buckled(使弯曲)in the same way. Sperm whales(抹香鲸)were known
to seize the old-time whaleboats in their jaws and crush them.
The greatest________________(58)of whales is their diving ability.The sperm whale dives to the bottom foi
his________________(59)food,the octopus(章鱼).In that search he is known to go as far down as 3 , 200 feet,
where the________________(60)is 1,400 pounds,to a square inch.Doing so he will________________(61)underwa-
ter as long as one hour. Two special skills are involved in this storing up enough________________(62)(all
whales are air-breathed)and tolerating the great change in pressure.Just how he does it scientists have nol
_______________ (63).It is believed that some of the oxygen is stored in a special________________(64)of blood
vessels,rather than just held in the lungs.And it is believed that a special kind of oil in his head is some sort
of a compensating mechanism that________________(65)adjusts the internal pressure of his body.But since you
can't bring a live whale into the laboratory for study,no one knows just how these things work.
_________(56)
A:as
B:who
C:which
D:that

相关标签: 抹香鲸  

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在海豹和抹香鲸等深潜高手的肌肉中,肌红蛋白的含量都格外高。肌红蛋白是一种将血液中的氧吸收并储存起来的蛋白质,它为肌肉提供以后可使用的能量。因此,它们的肌肉在不需要进行呼吸的情况下还能坚持长时间的工作。此外,为了节约能量,在下潜时它们还具有降低心率的神奇本领。在美国的加利福尼亚大学,两组科研人员得出的结论颇为接近。7头小海象在陆地上的平均心跳为每分钟107次,当它们在海水中下潜时,心跳下降到每分钟39次,下降了64%。在它们潜水的初期,心率一般急剧降低,随着它们下潜的深度不断加大,心率随之缓慢下降,极限记录是每分钟3次。
根据上述文段,下列说法不正确的是:
A.像海豹和抹香鲸那样的深海潜水动物体内肌红蛋白的含量,明显高于一般的动物
B.肌红蛋白是一种蛋白质,它能将血液中的氧吸收并储存起来,可以让肌肉在无法呼吸的情况下还能坚持长时间的工作
C.深潜高手在下潜时具有降低心率的本领,这样可以节约能量
D.研究表明,7头小海象在海水中下潜时,心率不断缓慢下降,可以由每分钟107次下降到每分钟3次

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“水滴”船

  世界上最大的动物是什么?是生活在海洋里的哺乳动物——鲸。其中,最大的蓝鲸身长约30米,体重100吨左右,相当于30头大象或1000头公牛。  谁能想到,如此庞大的大鲸,(竞 竞)是海洋中最优秀的游泳健将之一。“海上霸王”虎鲸,每小时可游55公里;上百吨的抹香鲸还是海洋中的潜水冠军呢!另外,大鲸还有这样一些本领:既能从静止不动立(既 即)达到全速游动,又能马上“刹车”;既能快速下潜,也能快速上浮。这些本领,是任何舰艇都望尘莫及的。  鲸的体形特殊:硕大的头部,急速收缩的尾部,前肢演变成不大的鳍,后肢已经退化,整个身体像一(颗 棵)拉长了的“水滴”。这类体形能大大减少水的阻力,十分适合在水中活动。  舰船设计师们由大鲸的体形联想到船舶,设计了多种水滴似的鲸形船。(已 以)往的一些客轮、货轮的水下部分都是刀形,现在都改成鲸形,有的超级油轮也模(仿 妨)鲸的体形,因而加快了航速。  原先的核潜艇是雪茄形的,现在,出现了一些水滴形的现代化水下核潜艇。与雪茄形核潜艇相比,水滴形核潜艇所受到的水的阻力可以减少20%~30%,再加上核动力装置,功率有所增加,在水下航行时,速度有了大幅度的提高。1.在文中的括号内用“√”标出正确的汉字。2.选择正确的说法,在括号中打“√”。(1)鲸是一种哺乳动物。()(2)鲸是鱼类的一种。()(3)鲸有蓝鲸、大鲸、虎鲸、抹香鲸等种类。()3.“这些本领,是任何舰艇都望尘莫及的。”这句话中“这些本领”指哪些本领?“望尘莫及”是什么意思?___________________________4.文章是从哪几个方面来介绍鲸的?___________________________5.舰船设计师们从鲸身上得到哪些启示?为人类作出了什么贡献?___________________________

下列说法错误的是:
A.1光年相当于94600万千米B.世界气候的推动力是太阳C.热带雨林是最容易维持生态平衡的生态系统D.地球上大脑最大的动物是抹香鲸
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