A question about destructor

Hello everyone, I learned a code sample from a book.

#include <fstream>
#include <string>
using namespace std;

class HowMany {
    static int objectCount;
public:
    HowMany() { objectCount++; }
    static void print(const string& msg = "")
    {
        if(msg.size()!=0)
            cout << msg << ":" << "objectCount = " << objectCount << endl;
    }
    ~HowMany()
    {
        objectCount--;
        print("~HowMany()");
    }
};
int HowMany::objectCount = 0;

HowMany f(HowMany x)
{
    x.print("x argument inside f()");
    return x;
}
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    int nRetCode = 0;

    // initialize MFC and print and error on failure
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        // TODO: change error code to suit your needs
        _tprintf(_T("Fatal Error: MFC initialization failed\n"));
        nRetCode = 1;
    }
    else
    {
        HowMany h;
        HowMany::print("after construction of h");
        HowMany h2 = f(h);
        HowMany::print("after call to f()");
    }

    return nRetCode;
}

I'm a C++ beginner,and now I have three questions:
1. Why the destructor will be called at the end of "HowMany f(HowMany x) "
function, I think the "x" object is not a new object, it's an object passed
from outside of this function.
2. Why the desturctor will be called twice at the end of main function.
3. It is not related with the code sample. I wonder CLS is really useful to
C++? Is it better than MFC?
Thanks
                                                                             
                     Lorry