A．His idea to create “Sofa Boy”．

　　B．His great achievement in games as a kid．

　　C．His hard times to set up his game company．

　　D．His enthusiasm for games when he was a small boy．

　　Do dogs understand us?

　　Be careful what you say around your dog．It might understand more than you think．

　　A border collie named Rico recognizes the names of about 200 objects, say researchers in Germany．The dog also appears to be abllearn new words as easily as a 3-year-old child．Its word-learning skillsIn one experiment, the researchers took all 200 items that Rico is supposed to know and divided them into 20 groups of 10 objects．Then the owner told the dog to go and fetch one of the items and bring it bacIn four tests, Rico got 37 out of 40 commands right．As the dog couldn't see anyone to get clues, the scientists believe Rico must understand the meanings of cetain words．

　　In another experiment, the scientists took one toy that Rico had never seen before and put it in a room with seven toys whose names the dog already knew．The owner then told Rico to fetch the object, using a word the dog had never heard before．

　　The correct object was chosen in seven out of ten tests, suggesting that the dog had worked

　　out the answer by process of elimination（排除法）．A month later, Rico remembered half of the new names, which is even more impressive．

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