（7-1）定义了Animal类、Cat类和Dog类，则（）代码段是正确的。 class Animal{ }; class Cat extends Animal{} class Dog extends Animal{}

11.classAnimal{publicStringnoise（）{returnpeep”；}}12.classDogextendsAnimal{13.publicStringnoise（）{returnbark”；}14.}15.classCatextendsAnimal{16.publicStringnoise（）{returnmeow”；}17.}.....30.Animalanimal=newDog（）；31.Catcat=（Cat）animal；32.System.out.printIn（cat.noise（））；Whatistheresult？（）

A.peep

B.bark

C.meow

D.Compilationfails.

E.Anexceptionisthrownatruntime.

Which of the following animals is NOT colorblind?

A．Monkey.

B．Dog.

C．Cat.

D．Tiger.

【B2】

A．cat

B．dog

C．snake

A．Rat flea.

B．Cat flea.

C．Dog flea.

D．Rabbit flea.

Which of the following is INCORRECT?

A．It is really hard to explain why dogs and cats are colorblind.

B．Some colorblind animals have dull-colored coats.

C．Some colorblind animals hunt for food in the dark of night.

D．Some colorblind animals graze in the dim twilight hours.

Animal is a super-ordinate term, while cow, horse, pig, dog, cat, etc. are ____.

A. hypernym

B. synonym

C. homonym

D. hyponyms

A．Rat flea.

B．Cat flea.

C．Dog flea.

D．Rabbit flea.

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);