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

（责任编辑：pgl）

共10页,当前第8页  第一页  前一页  下一页