It's hard to know if all dogs understand at least some of the words we say. Even if they do, they can't talk back. Still, it wouldn't hurt to sweet-talk your dog every now and then. You might just get a big, wet kiss in return!

　　50. From paragraph 2 we know that __        .

　　A. animals are as clever as human beings

　　B. dogs are smarter than parrots and chimpanzees

　　C. chimpanzees have very good word-learning skills

　　D. dogs have similar ‘learning abilities’ as 3-year-old children

　　51. Both experiments show that          .

　　A. Rico is smart enough to get all commands right

　　B. Rico can recognize different things including toys

　　C. Rico has developed the ability of learning mathematics

　　D. Rico won't forget the names of objects once recognizing them

　　52. Which of the following statements is true?

　　A. The purpose of the experiments is to show the border collie's mental abilities.

　　B. Rico has a better memory partly because of its proper early training.

　　C. The border collie is world-famous for recognizing objects.

　　D. Rico is born to understand its owner's commands.

　　53. What does the writer want to tell us?

　　A. To train your dog.                       B. To talk to your dog.

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