学位英语

完形填空

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 front flippers(鳍状肢)，used for steering and stability, are traces of feet.

__________ . (51)of this.Its 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 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 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 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 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.

51 A aspects

B signs

C ways

D reasons

52 A worked

B divided

C built

D moved

53 A at

B in

C of

D with

54A number

B degree

C distance

D rate

55A abandon

B attack

C leave

D board

56A as

B who

C which

D that

57A had

B operated

C Seen

D caught

58A interest

B job

C danger

D mystery

59A favorite

B fast

C new

D sufficient

60A depth

B pressure

C level

D size

61A set

B become

C remain

D rest

62A heat

B energy

C food

D oxygen

63A witnessed

B determined

C applied

D calculated

64A system

B place

C arrangement

D equipment

65A mentally

B artificially

C manually

D automatically

参考答案：

51.答案为B。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”，鲸鱼具有陆地上哺乳动物的一些特征，故选B。

52.答案为c。something is built into…的意思是“把……装(建、插)入……”，这里指鲸鱼生有巨大的气力。其他几个选项意思上讲不通。

53.答案为A。只能用介词at，不能用其他介词。

54.答案为D。rate表示“速度”，从上下文来讲，选D意思才讲得通。

55.答案为B。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。

56.答案为C。这里是一非限定性定语从句，关系代词作 主语，用which，故选C。

57.答案为A。have + something+过去分词是一固定结构，此处只能选A。

58.答案为D。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，所以说是个迷，故选D。

59.答案为A。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。

60.答案为B。空格后面的名词是pound，重量单位，据此可以判断选B，因为其他几个选项不能和pound搭配。

61.答案为C。呆在水下要用动词remain，其他几个动词放入空格处意思讲不通。

62.答案为D。此题也必须在读懂上下文意思的基础上才能作出判断，这里指鲸鱼聚集氧气，故选D。

63.答案为B。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deterrmine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。

64.答案为A。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。

65.答案为D。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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