用Verilog语言设计一个2选1数据选择器的组合逻辑电路。要求如下：1，写出能够实现该电路功能的代码 2，写出该代码的测试激励

以下是Verilog语言设计的2选1数据选择器的组合逻辑电路代码：

module mux2x1(input a, b, sel, output y);
    assign y = (!sel & a) | (sel & b);
endmodule

测试激励如下：

module mux2x1_test;
    reg a, b, sel;
    wire y;
    
    mux2x1 uut(a, b, sel, y);
    
    initial begin
        $dumpfile("mux2x1.vcd");
        $dumpvars(0, mux2x1_test);
        
        // Test case 1
        a = 0;
        b = 0;
        sel = 0;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 2
        a = 0;
        b = 1;
        sel = 0;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 3
        a = 1;
        b = 0;
        sel = 0;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 4
        a = 1;
        b = 1;
        sel = 0;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 5
        a = 0;
        b = 0;
        sel = 1;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 6
        a = 0;
        b = 1;
        sel = 1;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 7
        a = 1;
        b = 0;
        sel = 1;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
        
        // Test case 8
        a = 1;
        b = 1;
        sel = 1;
        #10 $display("a = %b, b = %b, sel = %b, y = %b", a, b, sel, y);
    end
endmodule

以上测试激励可以测试2选1数据选择器的所有可能输入。在仿真时，可以从模拟的输出波形中验证电路是否按照预期工作。