D．the sales of mobile phones will decrease as MOBVIS comes on market

　　B

　　John Thornton had been ill in December，and his two friends had had to leave him at White River and go on to Dawson.They left him in the camp with plenty of food，and with his two dogs，Skeet and Blackie.Now the spring had come，and he was almost well.He lay in the sun by the river with Buck，watching the water and listening to the birds，slowly getting stronger and stronger.

　　A rest is very welcome after running five thousand kilometres，and Buck slowly got fatter and stronger.It was a peaceful，lazy time for both man and dogs while they waited for Thornton's friends to return from Dawson.

　　Skeet made friends with Buck immediately，and while Buck was still very ill, every morning she washed his cuts carefully with her tongue.Blackie，too，was friendly，and as Buck grew stronger，the three dogs often played games together.Sometimes Thornton joined the games too.

　　The days passed very happily，and for the first time，Buck learned to love.He had never loved a man before.He and Mr Miller in the Santa Clara valley had been very good friends，but Buck had not loved him.John Thornton had saved his life，but he was also a man who was naturally kind to animals.He took very good care of his dogs，not because it was sensible to do that, but because he felt they were his children. He was always talking to Buck，holding his head and shaking it lovingly.In answer，Buck liked to take Thornton's hand gently in his mouth.

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