每日一练：职称英语考试理工类每日一练(2019/10/24)
【单选题】
The GreatestMystery Of Whales
The whale is a warm-blooded,air-breathing animal, giving birth to its young alive,sucking them -- and, likeall mammals, originated on land. There are many front flippers(鳍状肢), used for steering and stability, are traces offeet,(51)__________of this. Its Immensestrength is (52)__________ into thegreat body of the big whales, and in fact most of a whale'sbody is one giganticmuscle. The blue whale's pulling strength has been estimated (53)__________400horsepower. One specimen was reported to have towed (拖)a whaling vessel for sevenhours 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. Morerecently,steel ships have (57)__________their plates buckled (使弯曲) in the same way. Sperm whales (抹香鲸) wereknown to seize the old-time whaleboats in their jaws and crush them.
The greatest (58)__________ ofwhales is their diving ability. The sperm whale dives to theBottom for his(59)__________ food, the octopus (章鱼). In that searchhe is known to go as farDown as 3,200 feet, where the. (60)__________ is 1,400pounds, to a square inch. Doing so hewill (61)__________ underwater long as onehour. Two special skills are involved in this storing upenough (62) __________(all whales are air-breathed) and tolerating the great change in pressure.Justhow he does it scientists have not (63) __________. It is believed that some ofthe oxygen isstored in a special (64) of blood vessels, rather than just heldin the lungs. And it isbelieved that a special kind of oil in his head is somesort of compensating mechanism that _(65)__________adjusts the internalpressure of his body. But since you can't bring a live whale intothe laboratoryfor study, no one knows just how these things work.
请在第__(51)__处填上正确答案。
A.aspects
B.signs
C.ways
D.reasons
52、请在第__(52)__处填上正确答案。
A.worked
B.divided
C.built
D.moved
53、请在第__(53)__处填上正确答案。
A.at
B.in
C.of
D.with
54、请在第__(54)__处填上正确答案。
A.number
B.degree
C.distance
D.rate
55、请在第__(55)__处填上正确答案。
A.abandon
B.attack
C.leave
D.board
56、请在第__(56)__处填上正确答案。
A.as
B.who
C.which
D.that
57、请在第__(57)__处填上正确答案。
A.had
B.operated
C.Seen
D.caught
58、请在第__(58)__处填上正确答案。
A.interest
B.job
C.danger
D.mystery
59、请在第__(59)__处填上正确答案。
A.favorite
B.fast
C.new
D.sufficient
60、请在第__(60)__处填上正确答案。
A.depth
B.pressure
C.level
D.size
61、请在第__(61)__处填上正确答案。
A.set
B.become
C.remain
D.rest
62、请在第__(62)__处填上正确答案。
A.heat
B.energy
C.food
D.oxygen
63、请在第__(63)__处填上正确答案。
A.witnessed
B.determined
C.applied
D.calculated
64、请在第__(64)__处填上正确答案。
A.system
B.place
C.arrangement
D.equipment
65、请在第__(65)__处填上正确答案。
A.mentally
B.artificially
C.manually
D.automatically
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