About Inherit in C++

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C++

inheritance

I create a class name "CExchangeRate". I got an error when I attempt to create a class name "CExchangeRates" which inherit from CList<cexchangerate,cexchangerate&>.
The error description is: error C2512:'CExchangeRate': no appropriate default constructor available.Who can help me?

Codes of CExchangeRate:

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

class CExchangeRate
{
public:
    CExchangeRate(string dividendCurrency,string divisorCurrency,double result);
    ~CExchangeRate(void);
    string displayInfo();
private:
    string _dividendCurr;
    string _divisorCurr;
    double _result;
};

Codes of CExchangeRates:

#include <Afxtempl.h>
#include "ExchangeRate.h"
class CExchangeRates : public CList<CExchangeRate,CExchangeRate&>
{
public:
    CExchangeRates(void);
    ~CExchangeRates(void);
};