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.

　　C. To be friendly to your dog.        D. To be careful with your dog.

　　参考答案

　　1-5 CDBCD

　　6-10 ADCBB

　　11-15 DDCDA

　　16-20 BCBDB

　　21-25ABCAC

　　26-30 BDABC  31-35 CADAB   36-40 CBDDC  

　　41-45 AADCB

　　46-50 CBBB

　　51-55 CBBC

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