帮帮忙，到底怎么了

// Ex_Research7Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Ex_Research7.h"
#include "Ex_Research7Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
 CAboutDlg();

// Dialog Data
 //{{AFX_DATA(CAboutDlg)
 enum { IDD = IDD_ABOUTBOX };
 //}}AFX_DATA

 // ClassWizard generated virtual function overrides
 //{{AFX_VIRTUAL(CAboutDlg)
 protected:
 virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
 //}}AFX_VIRTUAL

// Implementation
protected:
 //{{AFX_MSG(CAboutDlg)
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
 //{{AFX_DATA_INIT(CAboutDlg)
 //}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 //{{AFX_DATA_MAP(CAboutDlg)
 //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
 //{{AFX_MSG_MAP(CAboutDlg)
  // No message handlers
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx_Research7Dlg dialog

CEx_Research7Dlg::CEx_Research7Dlg(CWnd* pParent /*=NULL*/)
 : CDialog(CEx_Research7Dlg::IDD, pParent)
{
 //{{AFX_DATA_INIT(CEx_Research7Dlg)
  // NOTE: the ClassWizard will add member initialization here
 //}}AFX_DATA_INIT
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEx_Research7Dlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 //{{AFX_DATA_MAP(CEx_Research7Dlg)
  // NOTE: the ClassWizard will add DDX and DDV calls here
 //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEx_Research7Dlg, CDialog)
 //{{AFX_MSG_MAP(CEx_Research7Dlg)
 ON_WM_SYSCOMMAND()
 ON_WM_PAINT()
 ON_WM_QUERYDRAGICON()
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx_Research7Dlg message handlers

BOOL CEx_Research7Dlg::OnInitDialog()
{
 CDialog::OnInitDialog();

 // Add "About..." menu item to system menu.
CheckRadioButton(IDC_AGE_L18,IDC_AGE_M38,IDC_AGE_18T27);
CheckRadioButton(IDC_CM_FTTL,IDC_CM_OTHER,IDC_CM_LAN);
CButton*pBtn=(CButton*)GetDlgItem(IDC_DO_POP);
pBtn->SetCheck(1);
CheckRadioButton(IDC_TIME_L1,IDC_TIME_M3,IDC_TIME_L2);
 // IDM_ABOUTBOX must be in the system command range.
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
 ASSERT(IDM_ABOUTBOX < 0xF000);

 CMenu* pSysMenu = GetSystemMenu(FALSE);
 if (pSysMenu != NULL)
 {
  CString strAboutMenu;
  strAboutMenu.LoadString(IDS_ABOUTBOX);
  if (!strAboutMenu.IsEmpty())
  {
   pSysMenu->AppendMenu(MF_SEPARATOR);
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
  }
 }

 // Set the icon for this dialog.  The framework does this automatically
 //  when the application's main window is not a dialog
 SetIcon(m_hIcon, TRUE);   // Set big icon
 SetIcon(m_hIcon, FALSE);  // Set small icon
 
 // TODO: Add extra initialization here
 
 return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEx_Research7Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)
 {
  CAboutDlg dlgAbout;
  dlgAbout.DoModal();
 }
 else
 {
  CDialog::OnSysCommand(nID, lParam);
 }
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CEx_Research7Dlg::OnPaint()
{
 if (IsIconic())
 {
  CPaintDC dc(this); // device context for painting

  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

  // Center icon in client rectangle
  int cxIcon = GetSystemMetrics(SM_CXICON);
  int cyIcon = GetSystemMetrics(SM_CYICON);
  CRect rect;
  GetClientRect(&rect);
  int x = (rect.Width() - cxIcon + 1) / 2;
  int y = (rect.Height() - cyIcon + 1) / 2;

  // Draw the icon
  dc.DrawIcon(x, y, m_hIcon);
 }
 else
 {
  CDialog::OnPaint();
 }
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CEx_Research7Dlg::OnQueryDragIcon()
{
 return (HCURSOR) m_hIcon;
}

void CEx_Research7Dlg::OnOK()
{
 // TODO: Add extra validation here
CString str, strCtrl;
str="你的年龄:";
UINT nID=GetCheckedRadioButton(IDC_AGE_L18,IDC_AGE_M38);
GetDlgItemText(nID,strCtrl);
str=str+strCtrl;

str=str+"\n你使用的接入方式:";
nID=GetCheckedRadioButton(IDC_CM_FTTL,IDC_CM_OTHER);
GetDlgItemText(nID,strCtrl);
str=str+strCtrl;

str=str+"\n你上网的主要是:\n";
UINT nCheckIDs[4]={IDC_DO_POP,IDC_DO_READ,IDC_DO_GAME,IDC_DO_OTHER};
CButton*pBtn;
for(int i=0;i<4;i++);
{
 pBtn=(CButton*)GetDlgItem(nCheckIDs[i]);
 if(pBtn->GetCheck())
 {
  pBtn->GetWindowText(strCtrl);
  str=str+strCtrl;
  str=str+" ";
 }
}

str=str+"\n你每天上网的平均时间:\n";
nID=GetCheckedRadioButton(IDC_TIME_L1,IDC_TIME_M3);
GetDlgItemText(nID,strCtrl);
str=str+strCtrl;
MessageBox(str); 
 CDialog::OnOK();
}

不知道为什么运行的结果与我想要的不同？

第三个问题应该出现 你上网主要是：收发邮件，浏览资料，聊天游戏，其他。可是运行的结果却是 你上网主要是：单位LAN。为什么哩！求助。。。