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阅读下面代码: import java.awt.*; public class Exam11_1 { private Frame f; private Button bl,b2,b3,b4; public static void main(String args[] { Exam11_1 that = new Exam11_1 (); that. go(); } public void go () { ______; f.setLayout(new FlowLayout());; bl = new Button ("Button 1"); b2 = new Button ("Button 2"); b3 = new Button ("Button 3"); b4 = new Button ("Button 4"); f.add(b1); f.add(b2); f.add(b3); f.add(b4); f.pack(); f.setVisible(true); } } 请在程序中画线处填写正确的语句 【13】 ,以便编译运行程序后得到正确的结果。

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A. 抑制甲状腺激素生物合成
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Many parents today assume that their children will be in an advantageous position if they start striving competitively for excellence at an early age.

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