WHY

@if(0)==(0) echo off
cscript //nologo //e:jscript "%~f0" < b.txt
pause & goto :EOF
@end

var arr = [], i = j = 0;
var fso = new ActiveXObject('Scripting.FileSystemObject');
var str = fso.OpenTextFile('a.txt', 1).ReadAll();

while(!WSH.StdIn.AtEndOfStream){
    var n = Math.floor( i++ / 4 );
    if(!arr[n]) arr[n] = [];
    arr[n].push( WSH.StdIn.ReadLine() );
}

str = str.replace(/^教程如图所示：(?=\r\n|$)/gm, function(s){if(arr[j]) s+='\r\n'+arr[j].join('\r\n'); j++; return s});
WSH.Echo(str)
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WHY

@echo off
(for /f "delims=" %%i in ('findstr /n .* a.txt') do (
    set "str=%%i"
    setlocal enabledelayedexpansion
    set "str=!str:*:=!"
    echo;!str!
    if "!str!" == "教程如图所示：" (
        for /L %%j in (1 1 4) do (
            set "str=" & set /p "str="
            if not "!str!" == "" echo;!str!
        )
    )
    endlocal
)) < b.txt
pause
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WHY

gawk "1;/^教程如图所示：$/{for(i=0;i<4;i++){getline s<\"b.txt\";if(s){print s;s=\"\"}}}" a.txt > c.txt
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