[填空题]
Given the following code, write a line of code that, when inserted at the indicated location, will make the overriding method in Extension invoke the overridden method in class Base on the current object.
class Base {
public void print() {
System.out.println("base");
}
}
class Extention extends Base {
public void print() {
System.out.println("extension");
// insert line of implementation here
}
}
public class Q294d {
public static void main(String args[]) {
Extention ext = new Extention();
ext.print();
}
}
Fill in a single line of implementation.（）

商业化经营获得成功的第一家大众化报纸是（）。 ["《纽约太阳报》","《泰晤士报》","《每日新闻》","《法国时报》"] 参加百度认证有哪些优势？（） ["权威象征","收录提升","精准锁定有需求的客户","优化展现品牌优势"] 政府质量监督机构参加建设工程项目竣工验收会议的目的是（）。 ["对建设过程质量情况进行总结，签发竣工验收意见书","对影响结构安全的工程实体质量进行检测","对影响使用功能的相关部分进行检查验收","对质量验收的程序、组织、方法、过程等进行监督"] 贸易保护的主要措施有（） ["征收进口关税","实行进口配额","非关税壁垒","实行出口补贴","降低出口商品税率"] 建筑地面工程施工中，整体面层施工后，养护时间不应小于（）d。 ["7","14","21","28"]

Given the following code, write a line of code that, when inserted at the indicated location, will make the overriding method in Extension invoke the overridden method in class Base on the current object.
class Base {
public void print() {
System.out.println("base");
}
}
class Extention extends Base {
public void print() {
System.out.println("extension");
// insert line of implementation here
}
}
public class Q294d {
public static void main(String args[]) {
Extention ext = new Extention();
ext.print();
}
}
Fill in a single line of implementation.（）

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