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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