举一反三
- 在前面几题的基础上，有子类Dog和Cat继承了父类Animal，如下空格的输出是以下哪个选项？dog = Dog(coco,small); cat = Cat(kawaii)>>> isinstance(dog, Animal)___________>>> isinstance(cat, Animal)___________>>> isinstance(dog, Dog)___________>>> isinstance(dog, Cat)____________
- xiaoli takes the dog back to the pet shop because she gets allergic to the dog.
- 若Animal是Cat,Dog的父类，则下列选项中，正确的是（） A: Animal animal = new Cat(); B: Animal a = new Cat(); Cat cat = (Cat) a; C: Animal animal = new Dog(); D: Cat cat = (Cat)new Dog();
- 若Animal是Cat,Dog的父类，则下列选项中，正确的是（） A: Animal animal = new Cat(); B: Cat cat = (Cat)new Animal(); C: Animal animal = new Dog(); D: Cat cat = (Cat)new Dog();
- The author wants to write ______. A: a clog book B: a cat book C: a dog and cat book D: a dog and a cat book
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有两个整型变量dog和cat,若要从磁盘文件把数据读到其中,正确的形式是______ 。 A: fscanf(dog ,2,1,fp); B: fscanf(fp,"%d%d",&dog ,&cat); C: fscanf(dog ,cat,2,1,fp); D: fscanf(fp,"%d",&dog ,&cat);
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定义Javacsript 数组的方法正确的是( )。 A: var arrayList={“cat”,”dog”,”monkey”}; B: var arrayList=new Array {“cat”,”dog”,”monkey”}; C: var arrayList= new Array (“cat”,”dog”,”monkey”); D: var arrayList= new Array [“cat”,”dog”,”monkey”];
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What was the narrator's favorite pet? A: A dog B: A monkey C: A parrot D: A black cat
- 3
在前面几题的基础上，有子类Dog和Cat继承了父类Animal，如下空格的输出是以下哪个选项？dog = Dog('coco','small'); cat = Cat('kawaii') >>> isinstance(dog, Animal) ___________ >>> isinstance(cat, Animal) ___________ >>> isinstance(dog, Dog) ___________ >>> isinstance(dog, Cat) ____________ A: True True False False B: True True True False C: True False False True D: True True True True
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(7-1)定义了Animal类、Cat类和Dog类,则()代码段是正确的。classAnimal{};classCatextendsAnimal{}classDogextendsAnimal{} A: Dog[] a = new Dog[5];a[0] = new Cat(); B: Animal a = new Animal[5];a[0] = new Animal(); C: Dog[]a = new Dog[5];a[0] = new Animal(); D: Cat[]a = new Cat[5];a[0] = new Cat();