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【单选题】
09 cat = (Cat) animal; 10 System.out.println(cat.noise()); 11 } else { 12 System.out.println("animal is not Cat's instance"); 13 } 14 } 15 } 16 class Dog extends Animal { 17 public String noise() { 18 return "Dog"; 19 } 20 } 21 class Cat extends Animal { 22 public String noise() { 23 return "Cat"; 24 } 25 }
A.
.Animal
B.
Dog
C.
Cat
D.
animal is not Cat's instance
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参考答案：
举一反三
【单选题】Nitrogen affects underwater divers in that ______.
A.
divers who come to the surface too quickly suffer severe pains
B.
the bloodstream of divers is compressed by excess nitrogen
C.
divers' spinal column is extremely painful for lack of nitrogen
D.
divers experience a condition known as the bends during diving
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【单选题】The underlined part in 'The colder water made the divers worse at simple arithmetic and other mental tasks' is a(n) ______.
A.
object
B.
direct object
C.
indirect object
D.
object complement
查看完整题目与答案
【判断题】由于市场均衡是需求和供给共同决定的,因此在需求不变的情况下,供给增加必然导致均衡数量减少。
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to the article, ______ .
A.
the more experienced divers are the less eye damage they have
B.
divers experience rigidity during diving
C.
differences between individual divers obstructed researchers' work
D.
eye damage can also occur in novice divers
查看完整题目与答案
【单选题】For hundreds of years, pearl divers have gathered pearls directly from mollusks on the seafloor. This is an extremely risky profession, exposing the divers to risks of drowning, air embolism, and shar...
A.
Shark attacks on pearl divers have decreased steadily over the last three decades because of declining shark populations.
B.
Cultured pearls are generally considered more beautiful than those made by artificial means.
C.
Robotic pearl harvesters can gather pearls faster and at less cost than human divers, although they may disturb aquatic communities.
D.
Part of the value of cultured pearls derives from the exotic way in which they are obtained.
E.
With the proper equipment and training, a diver employing scuba gear can harvest three times as many pearls per hour as can a free air diver.
查看完整题目与答案
【判断题】栈是一种 “先进先出”的数据结构。
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to Paragraph 6, why is manual uprooting a difficult process?
A.
It requires divers to undergo strenuous training.
B.
The algae's roots are usually too strong to pull out.
C.
It is necessary to remove every last piece of algae.
D.
The algae grow back faster than they can be removed.
查看完整题目与答案
【简答题】In 194the US anthropology student concluded that the Siriono Why did the divers perform. less well in colder conditions? A．They were less able to concentrate. B．Their body temperature fell too quickly...
查看完整题目与答案
【单选题】The manufacture of rubber breathing pipes made it possible for divers______on the surface of the water.
A.
float
B.
floating
C.
to float
D.
to be floated
查看完整题目与答案
【单选题】有保证的增长率G w 和自然增长率G n 的区别在于（）。
A.
G w 假定资本与劳动的比率不断提高，而G n 没有；
B.
G w 以充分就业为前提，而G n 没有；
C.
G w 随各种因素的变化而变化，是不稳定的增长率，而G n 是比较稳定的增长率；
D.
G w 一定小于G n
查看完整题目与答案
相关题目：
【单选题】Nitrogen affects underwater divers in that ______.
A.
divers who come to the surface too quickly suffer severe pains
B.
the bloodstream of divers is compressed by excess nitrogen
C.
divers' spinal column is extremely painful for lack of nitrogen
D.
divers experience a condition known as the bends during diving
查看完整题目与答案
【单选题】The underlined part in 'The colder water made the divers worse at simple arithmetic and other mental tasks' is a(n) ______.
A.
object
B.
direct object
C.
indirect object
D.
object complement
查看完整题目与答案
【判断题】由于市场均衡是需求和供给共同决定的,因此在需求不变的情况下,供给增加必然导致均衡数量减少。
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to the article, ______ .
A.
the more experienced divers are the less eye damage they have
B.
divers experience rigidity during diving
C.
differences between individual divers obstructed researchers' work
D.
eye damage can also occur in novice divers
查看完整题目与答案
【单选题】For hundreds of years, pearl divers have gathered pearls directly from mollusks on the seafloor. This is an extremely risky profession, exposing the divers to risks of drowning, air embolism, and shar...
A.
Shark attacks on pearl divers have decreased steadily over the last three decades because of declining shark populations.
B.
Cultured pearls are generally considered more beautiful than those made by artificial means.
C.
Robotic pearl harvesters can gather pearls faster and at less cost than human divers, although they may disturb aquatic communities.
D.
Part of the value of cultured pearls derives from the exotic way in which they are obtained.
E.
With the proper equipment and training, a diver employing scuba gear can harvest three times as many pearls per hour as can a free air diver.
查看完整题目与答案
【判断题】栈是一种 “先进先出”的数据结构。
A.
正确
B.
错误
查看完整题目与答案
【单选题】According to Paragraph 6, why is manual uprooting a difficult process?
A.
It requires divers to undergo strenuous training.
B.
The algae's roots are usually too strong to pull out.
C.
It is necessary to remove every last piece of algae.
D.
The algae grow back faster than they can be removed.
查看完整题目与答案
【简答题】In 194the US anthropology student concluded that the Siriono Why did the divers perform. less well in colder conditions? A．They were less able to concentrate. B．Their body temperature fell too quickly...
查看完整题目与答案
【单选题】The manufacture of rubber breathing pipes made it possible for divers______on the surface of the water.
A.
float
B.
floating
C.
to float
D.
to be floated
查看完整题目与答案
【单选题】有保证的增长率G w 和自然增长率G n 的区别在于（）。
A.
G w 假定资本与劳动的比率不断提高，而G n 没有；
B.
G w 以充分就业为前提，而G n 没有；
C.
G w 随各种因素的变化而变化，是不稳定的增长率，而G n 是比较稳定的增长率；
D.
G w 一定小于G n
查看完整题目与答案
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