问个笔试题，原谅我的题目真的没有看懂，求助求助

#include <stdio.h>

// [Instruction]
//      Write the function GetData() which pick out the data
//        from Buffer depending on the parameter in the following condition.
// Parameter   bit0 ~ 6 Data number
//                    bit7 Select higher rank data, lower rank data
//                                0: lower rank 8bit  1: higher rank 8bit

#define BUF_MAX 2
int Buffer[BUF_MAX] = { 0x1234, 0x5678 };

int GetData( unsigned char Select )
{
int Data;

/************************************************/
/* Write after line 18 to the next comment line.*/
/************************************************/


/************************************************/

return Data;
}

void main( void )
{
int a = GetData( 0x01 );
int b = GetData( 0x0a );
}