Mr.Ogden says another challenge for GiveBackMail is competition from the ruling e­mail providers：Google，Yahoo，Microsoft and AOL.“They can easily do the same thing themselves，”he says.“And because advertisers pay for viewers，the new service has the potential of reducing the big e­mail providers' income bit by bit.”

　　Mr.Yadegar is quick to deny that possibility.“They have such a significant user base，”he says，“while we can have a significant impact in the non­profit world by grasping only a very insignificant amount of their market share.”

　　A

　　Google

　　official

　　says the

　　company

　　regards GiveBackMail as just another e­mail choice.“We haven't tried this particular approach，but we think it's a good idea，”she says.

　　5．Which of the following ia TRUE of GiveBackMail?

　　A．It has been open for business for a long time.

　　B．Three charities have benefited from it.

　　C．Advertisers pay for the number of people who use the service.

　　D．It donates the majority of its profits to charity.

　　6．According to Mr.Ogden，all the following are challenges for GiveBackMail EXCEPT ______.

　　A．the fact that people don’t change their Web habits easily

　　B．the fact that it doesn’t offer financial rewards

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