【简答题】听下面一段对话, 回答第1-4题。 1. What does the woman work out for? A. Health. B Enjoyment. C. Good shape. 2. What does the man usually do? A. He plays baseball. B. He watches s on TV. C. He plays tennis w...
【单选题】指出如下Java代码的错误并解释原因,如何修改。 public abstract class Shap { public abstract double getArea(); } public class Square extends Shap{ private double height=0;// 正方形边长 public Square(double height) { super(); thi...