2015年职称英语理工类考试完形填空练习(1)

　　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，used for steering and stability, are traces of feet.

　　__________ . of this.Its Immense strength is __________ . into the great body of the big whales，and in fact most of a whales body is one gigantic muscle.The blue whales pulling strength has been estimated __________ . 400 horsepower.One specimen was reported to have toweda whaling vessel for seven hours at the __________. of eight knot .

　　An angry whale will __________ . A famous example of this was the fate of Whaler Essex, __________ . was sunk off the coast of South America early in the last century.More recently, steel ships have __________ . their plates buckledin the same way.Sperm whaleswere known to seize the old-time whaleboats in their jaws and crush Them.

　　The greatest __________ . of whales is their diving ability.The sperm whale dives to the Bottom for his __________ . food，the octopus.In that search he is known to go as far Down as 3,200 feet, where the. __________ . is 1,400 pounds，to a square inch.Doing so he

　　Will __________ . underwater long as one hour.Two special skills are involved in this storing up enough __________. and tolerating the great change in pressure.Just how he does it scientists have not __________ . .It is believed that some of the oxygen is stored in a special __________ . 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 __________ . adjusts the internal pressure of his body.But since you cant 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