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．______(1)of this．Its Immense strength is______(2)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 ______(3)400 horsepower．One specimen was reported to have towed(拖)a whaling vessel for seven hours at the______ (4) of eight knot (节). An angry whale will ______ (5) A famous example of this was the fate of Whaler Essex, ______ (6)was sunk off the coast of South America early in the last century．

　　More recently, steel ships have ______(7)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 ______ (8)of whales is their diving ability．The sperm whale dives to the Bottom for his______ (9)food，the octopus(章鱼)．In that search he is known to go as far Down as 3,200 feet, where the．______ (10)is 1,400 pounds，to a square inch．Doing so he Will ______ (11)underwater long as one hour．Two special skills are involved in this storing up enough______ (12)(all whales are air—breathed)and tolerating the great change in pressure．Just how he does it scientists have not ______(13)．It is believed that some of the oxygen is stored in a special______ (14)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 ______ (15)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．

　　1 A aspects B signs C ways D reasons

　　2 A worked B divided C built D moved

　　3 A at B in C of D with

　　4 A number B degree C distance D rate

　　5 A abandon B attack C leave D board

　　6 A as B who C which D that

　　7 A had B operated C Seen D caught

　　8 A interest B job C danger D mystery

　　9 A favorite B fast C new D sufficient

　　10 A depth B pressure C level D size11 A set B become C remain D rest

　　12 A heat B energy C food D oxygen

　　13 A witnessed B determined C applied D calculated

　　14 A system B place C arrangement D equipment

　　15 A mentally B artificially C manually D automatically

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