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共用题干 The Greatest Mystery of WhalesThe whale is a warm-blooded,air-breathing...

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问题 共用题干
The Greatest Mystery of Whales
The whale is a warm-blooded,air-breathing animal,giving birth to its young alive,sucking them-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 wha'e'sbo衡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 for 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)underwater as long as one hour.Two special1 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 not______(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.
选项 54._________
A:number
B:degree
C:distance
D:rate
答案D
解析第一段讲到鲸鱼和所有其他哺乳动物一样来源于陆地，最后一句举了一些例子来说明这一点。sign的意思是“符号，特征，迹象”，而空白处所在句是说有很多迹象表明鲸鱼来自陆地，故选B项。aspect方面，层面；way方法，方式；reason原因。
build into…的意思是“使……成为……的组成部分”，这里指鲸鱼具有巨大的力气。其他几个选项意思上讲不通。work工作，运行；divide划分；build建立，逐渐增强；move移动。
at表示“（速度、比率等）以，达”; horsepower表示“马力”。
rate表示“速度”，而空格后的“knot”是速度单位，表示每小时一海里，选D意思才讲得通。
此题必须根据上下文的意思来做。由后文中捕鲸船被击沉、钢船被击毁的事例可知，鲸鱼被惹怒后会攻击船只，所以选B0 abandon放弃；attack攻击；leave离开；board登（机），上（船）。
这里是一非限制性定语从句，先行词为物，并且关系代词作主语，应用which来引导，故选C。
" have sth.done”是常用表达，表示某事被做。operate操作；see看到，看见；catch抓住。
本题所在句子为该段主题句，谈的是鲸鱼的潜水能力。鲸鱼的潜水能力很强，能下潜到很深的地方并在水下停留长达1个小时之久，科学家们不解，所以说是个谜，故选D。 interest兴趣;job工作；danger危险，危害；mystery谜。
虽然本题的几个选项都能与food搭配，但从上下文意思来讲，只有A正确。favorit。最喜爱的；fast快速地；new新的；sufficient充足的。
空格后面说的是每平方英寸1400磅，用的是压强单位，故选B0 depth深度；pressure压强；level水平；size尺寸。
待在水下要用动词remain，其他几个动词放入空格处意思讲不通。set设置；become变为；remain保持，逗留；rest休息。
此题也必须在读懂上下文意思的基础上才能作出判断，这里指鲸鱼储存氧气，故选D。heat热量；energy能量；food食物；oxygen氧气。
这里是说关于鲸鱼为什么能够在水下承受巨大的压力，科学家们还没有找到答案。选项中的determine的意思是“确定”，此词放入空格处意思讲得通，其他几个选项讲不通，故选B。witness见证；apply运用；calculate计算。
special虽然和几个选项都能搭配使用，但只有选项A意思上讲得通，故A为正确答案，此处是指氧气储存在特殊的血管系统中。system系统；place地方；arrangement安排；equipment设备。
此题亦需根据上下文的意思作出判断。automatically的意思是“自动地”。mentally心理上地；artificially人工地；manually手工地。
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