rent things including toysРC. Rico has developed the ability of learning mathematicsРD. Rico won't forget the names of objects once recognizing themР52. Which of the following statements is true?РA. The purpose of the experiments is to show the border collie's mental abilities.РB. Rico has a better memory partly because of its proper early training.РC. The border collie is world-famous for recognizing objects.РD. Rico is born to understand its owner's commands.Р53. What does the writer want to tell us?РA. To train your dog. B. To talk to your dog.РC. To be friendly to your dog. D. To be careful with your dog.РРРР答案：Р1-5 CDBCD 6-10 ADCBB 11-15 DDCDA 16-20 BCBDB Р21-25ABCAC 26-30 BDABC 31-35 CADAB 36-40 CBDDC Р41-45 AADCB 46-50 CBBB 51-55 CBBC
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