2015年职称英语《理工类》B级完形填空试题（二）

　　The Greatest Mystery of Whales

　　The whale is a mammal - warm-blooded, air-breathing, giving birth to its young alive, sucking them-and, like all mammals, originated on land. There are many signs of this. __1__ front flippers, used for steering and stability, are traces of feet. #

　　Immense strength is built 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 __2__ has been estimated at 400 horsepower. One specimen was reported to have __3__ a whaling vessel for seven hours at the __4__ of eight knots. #

　　An enraged whale will attack a ship. A famous __5__ of this was the fate of whaler Essex, which was sunk __6__ South America early in the last century. More recently, steel ships have had their plates buckled in the same way. Sperm whales were known to __7__ the old-time whaleboats in their jaws and crush them. #

　　The greatest mystery of whales is their diving ability. The sperm whale __8__ the bottom for his favourite food, the octopus. __9__ he is known to go as far down as 3,200 feet, where the pressure is 1,400 pounds, to the square inch. Doing __10__ he will remain submerged as long as one hour. Two feats are involved in this : storing up enough __11__(all whales are air-breathed) and withstanding the great change in pressure. Just __12__ he dose it scientists have not determined. It is believed that some of the oxygen is stored in a special system of blood vessels, rather than just held in the lungs. And __13__ that a special kind of oil in his head is some sort of compensating mechanism that automatically adjusts the internal pressure of his body. But __14__ you can't bring a live whale into the laboratory for study, no one __15__ just how these things work.

　　EXERCISE:

　　1. A)Their B)His C)Theirs D)Its #

　　2. A)strength B)width C)height D)length

#

　　3. A)eaten B)crashed C)towed D)lifted

　　4. A)distance B)rate C)voyage D)sail #

　　5. A)picture B)film C)example D)book

　　6. A)off the coast of B)of the coast of C0away the coast of D)in the coast of

#

　　7. A)hit B)seize C)damage D)overturn

#

　　8. A)sink to B)rest on C)dive to D)hide on

#

　　9. A)In that search B)Because of this C)In spite of that D)In support of this #

　　10. A)so B)such C)above D)the same

#

　　11. A)air B)oxygen C)energy D)heat

#

　　12. A)what B)where C)how D)when #

　　13. A)it is believed B)he believes C)we believe D)it believes #

　　14. A)because of B)due to C)since D)owing to #

　　15. A)communicates B)knows C)hears D)develops

　　答案：D A C B C A B C A A B C A C B #