单选题The blue whale is（）largest animal in the world.AaBtheC–（不填）Dthe most
单选题
The blue whale is（）largest animal in the world.
A
a
B
the
C
–（不填）
D
the most
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共用题干The Greatest Mystery of WhalesThe whale is a warm一blooded,air-breathing animal,giving birth to its young alive,sucking them一and, like all mammals,originated on land. There are many________________(51)of this. Its front flippers（鳍状肢）, used for steering and stability,are traces of feet.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 foi 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)underwa-ter as long as one hour. Two special skills are involved in this storing up enough________________(62)(allwhales are air-breathed)and tolerating the great change in pressure.Just how he does it scientists have nol_______________ (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 a 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._________(63)A:witnessedB:determinedC:appliedD:calculated
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