填空题 WritealineofcodethatdeclaresavariablenamedlayoutoftypeLayoutManagerandinitializesitwithanewobject，whichwhenusedwithacontainercanlayoutcomponentsinarectangulargridofequal-sizedrectangles，3componentswideand2componentshigh.（）

单项选择题 Given that a static method doIt（） in a class Work represents work to be done， what block of code will succeed in starting a new thread that will do the work？   CODE BLOCK a：   Runnable r = new Runnable（） {   public void run（） {   Work.doIt（）；   }   }；   Thread t = new Thread（r）；   t.start（）；   CODE BLOCK b：   Thread t = new Thread（） {  public void start（） {   Work.doIt（）；  }  }；   t.start（）；   CODE BLOCK c：   Runnable r = new Runnable（） {   public void run（） {   Work.doIt（）；   }   }；   r.start（）；  CODE BLOCK d：   Thread t = new Thread（new Work（））；   t.start（）；   CODE BLOCK e：   Runnable t = new Runnable（） {   public void run（） {   Work.doIt（）；   }   }；   t.run（）；

单项选择题 What will be written to the standard output when the following program is run？（）  public class Qd803 {   public static void main（String args[]） {   String word = "restructure"；   System.out.println（word.substring（2， 3））；   }   }