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第1题

21. She always keeps her dog （ ） a stone in front of her house.(本题1.0分) A、 tying to B、 to tie C、 tie to D
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第2题

20. According to the third paragraph, birds including geese are used in many ways except （ ）.(本题1.0分) A、 making noi
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第3题

9. According to some scientists, many animals may be trained to do given jobs if they know （ ）.(本题1.0分) A、 who their
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第4题

18. (单选题) The trainer usually gives the animal a piece of candy or fruit （ ）. (本题1.0分) A、 before it plays a tric
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