The whale is a mammal(哺乳动物) 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.
(51) front flippers (鳍肢), 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 (52) has been estimated at 400 horsepower. One specimen was reported to have (53) a whaling vessel for seven hours at the (54) of eight knots.
An enraged whale will attack a ship. A famous (55) of this was the fate of whaler Essex, which was sunk (56) the coast of South America early in the last century. More recently, steel ships have had their plates buckled (扭曲变形) in the same way. Sperm whales were know
A. Their
B. it’s
C. Theirs
D. Its
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 (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 knots (节).
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