【简答题】What are the tree rings like in a favorable climate? A) Tree rings grow close together. B) Tree tings grow far apart. C) Tree tings are very large. D) The pattern of rings in a tree trunk is the same.
【单选题】现有: 1. class Tree { 2. private static String tree = "tree "; 3. String getTree () { return tree; } 4. } 5. class Elm extends Tree { 6. private static String tree = "elm "; 7. public s...