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(鰭狀肢)，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 (節(jié)).

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(使彎曲)in the same way.Sperm whales(抹香鯨)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(章魚).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

54

A number

B degree

C distance

D rate

55

A abandon

B attack

C leave

D board

56

A as

B who

C which

D that

57

A had

B operated

C Seen

D caught

58

A interest

B job

C danger

D mystery

59

A favorite

B fast

C new

D sufficient

60

A depth

B pressure

C level

D size

61

A set

B become

C remain

D rest

62

A heat

B energy

C food

D oxygen

63

A witnessed

B determined

C applied

D calculated

64

A system

B place

C arrangement

D equipment

65

A mentally

B artificially

C manually

D automatically　　參考答案：

51.答案為B。第一段講到鯨魚很像陸地上的哺乳動(dòng)物，最后一句舉了一些例子來說明這一點(diǎn)。sign的意思是“符號(hào)，特征”，鯨魚具有陸地上哺乳動(dòng)物的一些特征，故選B。

52.答案為c。something is built into…的意思是“把……裝(建、插)入……”，這里指鯨魚生有巨大的氣力。其他幾個(gè)選項(xiàng)意思上講不通。

53.答案為A。只能用介詞at，不能用其他介詞。

54.答案為D。rate表示“速度”，從上下文來講，選D意思才講得通。

55.答案為B。此題亦必須根據(jù)上下文的意思來推測(cè)選哪個(gè)詞。鯨魚被惹怒后會(huì)攻擊船只，所以選B。

56.答案為C。這里是一非限定性定語從句，關(guān)系代詞作 主語，用which，故選C。

57.答案為A。have + something+過去分詞是一固定結(jié)構(gòu)，此處只能選A。

58.答案為D。本題所在句子為該段主題句，談的是鯨魚的潛水能力。鯨魚的潛水能力很強(qiáng)，能下潛到很深的地方，科學(xué)家們不解，所以說是個(gè)迷，故選D。

59.答案為A。雖然本題的幾個(gè)選項(xiàng)都能與food搭配，但從上下文意思來講，只有A正確。

60.答案為B。空格后面的名詞是pound，重量單位，據(jù)此可以判斷選B，因?yàn)槠渌麕讉€(gè)選項(xiàng)不能和pound搭配。

61.答案為C。呆在水下要用動(dòng)詞remain，其他幾個(gè)動(dòng)詞放入空格處意思講不通。

62.答案為D。此題也必須在讀懂上下文意思的基礎(chǔ)上才能作出判斷，這里指鯨魚聚集氧氣，故選D。

63.答案為B。上文談到鯨魚為什么能夠在水下承受巨大的壓力，科學(xué)家們還沒有找到答案。選項(xiàng)中的deterrmine的意思是“確定”，此詞放入空格處意思講得通，其他幾個(gè)選項(xiàng)講不通，故選B。

64.答案為A。special雖然和幾個(gè)選項(xiàng)都能搭配使用，但只有選項(xiàng)A意思上講得通，故A為正確答案。

65.答案為D。此題亦需根據(jù)上下文的意思作出判斷。automatically的意思是“自動(dòng)地”。

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