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【单选题】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....
A.
Warm-bloodedness.
B.
Air-breathing.
C.
Giving birth to its young alive.
D.
Its front flippers.
【单选题】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....
A.
Storing enough oxygen in their lungs.
B.
Withstanding great pressure change.
C.
Their great strength.
D.
Their large size and great weight.
【单选题】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....
A.
400 horsepower.
B.
3,200 horsepower.
C.
1,d00 horsepower.
D.
eight horsepower.
【单选题】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....
A.
Because they cannot catch a whale tot study because of its great strength.
B.
Because whales are too dangerous to get close to.
C.
Because they can’t bring a whale alive into the laboratory for study.
D.
Because no scientists are interested in the subject.
【单选题】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....
A.
attack on a ship from all enraged whale.
B.
sea accidents in the last century.
C.
the great strengh of whales.
D.
how dangerous whale ar