共用题干 The Greatest Mystery of WhalesThe whale is a warm一blooded,air-breathing...

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问题共用题干 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.

选项 _________(53) A:at B:in C:of D:with

答案 A

解析第一段讲到鲸鱼很像陆地上的哺乳动物，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”，鲸鱼具有陆地上哺乳动物的一些特征，故选B。
something is built into…的意思是“把……装（建、插）入……”，这里指鲸鱼具有巨大的气力。其他几个选项意思上讲不通。
at表示“（速度、比率等）以，达”; horsepower表示“马力”。
ate表示“速度”，从上下文来讲，选D意思才讲得通。
此题亦必须根据上下文的意思来推测选哪个词。鲸鱼被惹怒后会攻击船只，所以选B。
这里是一非限制性定语从句，关系代词作主语，用which，故选C。
" have + something＋过去分词”是一固定结构。
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，科学家们不解，所以说是个谜，故选D。
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。
空格后面说的是每平方英寸1400磅，这指的是压强，故选B。
待在水下要用动词remain，其他几个动词放人空格处意思讲不通。
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。
上文谈到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”，此词放人空格处意思讲得通，其他几个选项讲不通，故选B。
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，此处是指氧气存在特殊的血管系统中。
此题亦需根据上下文的意思作出判断。automatically的意思是“自动地”。

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共用题干 The Greatest Mystery of WhalesThe whale is a warm一blooded,air-breathing...

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