类Cow和类Dog都是类Animal的一个子类，若Cow cow=new Cow()，则以下哪个选项会发生编译错误
举一反三
- I don’t like the________. A: 'white cow B: white' cow
- A horse ______ but a cow ______.
- There are many ______ grazing in the field. A: cows and sheeps B: cow and sheep C: cows and sheep D: cow and sheeps
- -Are those_____________? －No,they aren't. They're______________. A: sheep; cows B: sheep;cow C: sheeps;cow D: sheeps;cows
- In India the cow is a __________ and protected animal.